Problem Riddles With Answers

Problem Riddles

Problem riddles are a fun way to challenge your brain, test your logic, and improve your problem-solving skills. Unlike simple riddles that rely mostly on wordplay, problem riddles often present a situation that requires careful thinking, observation, calculation, or creative reasoning. Some may look easy at first but become surprisingly tricky once you examine all the details. Whether you’re a student, puzzle lover, teacher, or simply looking for an entertaining mental challenge, these problem riddles will give your brain plenty to think about. Read each problem carefully, try to solve it without looking at the answer, and see how many you can get right.

List of Problem Riddles

Riddle: What has hands but cannot clap?
Answer: Clock

Riddle: What has a neck but no head?
Answer: Bottle

Riddle: What goes up but never comes down?
Answer: Age

Riddle: What has keys but no locks?
Answer: Keyboard

Riddle: What gets wetter the more it dries?
Answer: Towel

Riddle: What can travel around the world while staying in one place?
Answer: Stamp

Riddle: What has a face and two hands but no arms or legs?
Answer: Clock

Riddle: What can you catch but not throw?
Answer: Cold

Riddle: What has one eye but cannot see?
Answer: Needle

Riddle: What runs but never walks?
Answer: River

Riddle: What has a head and tail but no body?
Answer: Coin

Riddle: What comes once in a minute, twice in a moment, but never in a thousand years?
Answer: Letter M

Riddle: What has many teeth but cannot bite?
Answer: Comb

Riddle: What has an eye but no sight?
Answer: Needle

Riddle: What breaks without being touched?
Answer: Promise

Riddle: What has legs but doesn’t walk?
Answer: Table

Riddle: What has a ring but no finger?
Answer: Telephone

Riddle: What has words but never speaks?
Answer: Book

Riddle: What is full of holes but still holds water?
Answer: Sponge

Riddle: What has cities but no houses?
Answer: Map

Riddle: What can you keep after giving it to someone?
Answer: Your word

Riddle: What goes up when rain comes down?
Answer: Umbrella

Riddle: What has a mouth but never eats?
Answer: River

Riddle: What has four wheels and flies?
Answer: Garbage truck

Riddle: What can’t talk but replies when spoken to?
Answer: Echo

Riddle: What is always in front of you but can’t be seen?
Answer: The future

Riddle: What has an end but no beginning?
Answer: A stick

Riddle: What has a thumb and four fingers but isn’t alive?
Answer: Glove

Riddle: What can be cracked, made, told, and played?
Answer: Joke

Riddle: What has a heart but no other organs?
Answer: Deck of cards

Riddle: What goes through cities and fields but never moves?
Answer: Road

Riddle: What can fill a room but takes no space?
Answer: Light

Riddle: What gets bigger the more you take away?
Answer: Hole

Riddle: What is always coming but never arrives?
Answer: Tomorrow

Riddle: What has a spine but no bones?
Answer: Book

Riddle: What has ears but cannot hear?
Answer: Corn

Riddle: What can run but never gets tired?
Answer: Water

Riddle: What has a tail and a head but no body?
Answer: Coin

Riddle: What belongs to you but others use it more?
Answer: Your name

Riddle: What has many keys but can’t open a door?
Answer: Piano

Riddle: What can be measured but has no length?
Answer: Time

Riddle: What has a bark but no bite?
Answer: Tree

Riddle: What comes down but never goes up?
Answer: Rain

Riddle: What has an eye but cannot cry?
Answer: Needle

Riddle: What has hands but can’t feel?
Answer: Clock

Riddle: What can’t be seen but can be felt?
Answer: Wind

Riddle: What has one foot but many shoes?
Answer: Ruler

Riddle: What is lighter than a feather but hard to hold?
Answer: Breath

Riddle: What gets sharper the more you use it?
Answer: Brain

Riddle: What has stripes but no color choice?
Answer: Zebra

Riddle: What is bought by the yard but worn by the foot?
Answer: Carpet

Riddle: What has a bed but never sleeps?
Answer: River

Riddle: What has a mouth but never talks?
Answer: Cave

Riddle: What goes up and down but stays in place?
Answer: Stairs

Riddle: What has a lock but no key?
Answer: Hair

Riddle: What has a face but no eyes?
Answer: Clock

Riddle: What has teeth but cannot eat?
Answer: Zipper

Riddle: What is easy to lift but hard to throw?
Answer: Feather

Riddle: What comes at night without being called?
Answer: Sleep

Riddle: What can’t be used until it’s broken?
Answer: Egg

Riddle: What has four fingers and a thumb but isn’t alive?
Answer: Glove

Riddle: What has an end but no start?
Answer: Rope

Riddle: What can be long or short, cold or hot?
Answer: Time

Riddle: What has pages but no stories?
Answer: Notebook

Riddle: What runs all day but never leaves its place?
Answer: Clock

Riddle: What can fly without wings?
Answer: Time

Riddle: What gets older but never grows?
Answer: Shadow

Riddle: What has a back but no front?
Answer: Chair

Riddle: What has words but no voice?
Answer: Book

Riddle: What is always behind you but unseen?
Answer: The past

Riddle: What can be opened but never closed?
Answer: Mind

Riddle: What has holes but no cheese?
Answer: Sponge

Riddle: What is invisible but weighs something?
Answer: Air

Riddle: What has a face but no expression?
Answer: Coin

Riddle: What moves without legs?
Answer: Snake

Riddle: What has a point but no edge?
Answer: Idea

Riddle: What can be heard but not seen?
Answer: Sound

Riddle: What has a shell but no nut?
Answer: Egg

Riddle: What has wings but doesn’t fly?
Answer: Building

Riddle: What can grow but has no life?
Answer: Shadow

Riddle: What has a lid but no box?
Answer: Eye

Riddle: What has many letters but no words?
Answer: Post office

Riddle: What has weight but no mass?
Answer: Shadow

Riddle: What goes around the house but never enters?
Answer: Fence

Riddle: What is always ahead of you?
Answer: Future

Riddle: What has keys but can’t type?
Answer: Piano

Riddle: What has a foot but no legs?
Answer: Mountain

Riddle: What has a tongue but cannot speak?
Answer: Shoe

Riddle: What can be borrowed but never returned?
Answer: Time

Riddle: What has lines but no words?
Answer: Notebook

Riddle: What can be stolen without touching?
Answer: Heart

Riddle: What has a body but no bones?
Answer: Shirt

Riddle: What can be seen once in a year, twice in a week, never in a day?
Answer: Letter E

Riddle: What can be broken but never held?
Answer: Promise

Riddle: What has roots but no plant?
Answer: Math problem

Riddle: What can be felt but never seen?
Answer: Emotions

Riddle: What has corners but no edges?
Answer: Circle

Riddle: What speaks all languages but has no voice?
Answer: Music

Riddle: What has an eye but no sight?
Answer: Storm

Riddle: What is always moving but never leaves?
Answer: Time

Category Wise Problem Riddles

Easy Problem Riddles

1. Three friends pay $30 for a room. Later, the hotel realizes the room should cost $25 and sends back $5. The bellboy keeps $2 and gives each friend $1. Each friend paid $9, making $27 total, and the bellboy kept $2. Where is the missing dollar?

Answer: There is no missing dollar. The $27 already includes the $2 kept by the bellboy. The correct calculation is $25 for the room + $2 kept by the bellboy = $27.

2. A farmer has 17 sheep. All but 9 run away. How many sheep are left?

Answer: 9.

3. You have three apples and take away two. How many apples do you have?

Answer: Two. You took two apples.

4. A clock shows 3:15. What is the angle between the hour and minute hands?

Answer: 7.5 degrees.

5. A family has two parents and six sons. Each son has one sister. How many people are in the family?

Answer: Nine people: two parents, six sons, and one daughter.

6. You are running a race and pass the person in second place. What position are you in?

Answer: Second place.

7. A basket contains six eggs. Six people each take one egg, but one egg remains in the basket. How?

Answer: The last person takes the basket with the final egg inside it.

8. If yesterday was Sunday, what day will it be tomorrow?

Answer: Tuesday.

9. A pencil and an eraser cost $1.10 together. The pencil costs $1 more than the eraser. How much does the eraser cost?

Answer: 5 cents. The pencil costs $1.05.

10. A shepherd has 10 sheep. All but 3 die. How many sheep remain?

Answer: Three.

Logic Problem Riddles

11. You are standing before two doors. One leads to safety and one leads to danger. Two guards stand there. One always tells the truth, and one always lies. You may ask one guard one question. What should you ask?

Answer: Ask either guard, “Which door would the other guard say leads to safety?” Then choose the opposite door.

12. There are three switches outside a room and one light bulb inside. You can enter the room only once. How can you determine which switch controls the bulb?

Answer: Turn on the first switch for a few minutes, then turn it off. Turn on the second switch and enter the room. If the bulb is on, it is controlled by the second switch. If it is off but warm, it is controlled by the first. If it is off and cold, it is controlled by the third.

13. Four people need to cross a bridge at night. They have one flashlight, and only two people can cross at a time. Their crossing times are 1, 2, 7, and 10 minutes. What is the fastest total time?

Answer: 17 minutes.

14. You have a 3-liter jug and a 5-liter jug. How can you measure exactly 4 liters?

Answer: Fill the 5-liter jug and pour it into the 3-liter jug. Two liters remain. Empty the 3-liter jug, transfer the 2 liters into it, then fill the 5-liter jug again and pour 1 liter into the 3-liter jug. Four liters remain in the 5-liter jug.

15. You have two ropes. Each takes exactly one hour to burn, but they burn unevenly. How can you measure exactly 45 minutes?

Answer: Light both ends of one rope and one end of the other. The first rope burns in 30 minutes. Then light the second end of the remaining rope. It will burn for another 15 minutes.

16. There are several bottles, and exactly one contains poison. You have test strips that can identify poison after several hours. How could you identify the bottle using a binary testing strategy?

Answer: Number the bottles and assign each bottle a unique binary pattern. Test samples according to the binary positions, then use the pattern of positive results to identify the poisoned bottle.

17. Three prisoners are given hats that are either black or white. Each can see the others’ hats but not their own. They are told at least one hat is black. After silence, one prisoner correctly identifies his hat. How?

Answer: He reasons from what the others would have said if his hat were white and concludes that his hat must be black.

18. A farmer needs to cross a river with a wolf, a goat, and a cabbage. The boat can carry the farmer and only one item. How can he transport all three safely?

Answer: Take the goat across, return alone, take the wolf across, bring the goat back, take the cabbage across, return alone, then take the goat across.

19. You have 100 light bulbs and 100 people. Person 1 changes every bulb, person 2 changes every second bulb, person 3 every third bulb, and so on. Which bulbs remain on?

Answer: The bulbs whose numbers are perfect squares.

20. Two candles each burn for exactly one hour, but unevenly. How can you measure 30 minutes?

Answer: Light both ends of one candle at the same time. It will burn completely in 30 minutes.

Tricky Problem Riddles

21. A father and his son are in a car accident. The father dies, and the boy is taken to the hospital. The surgeon says, “I cannot operate on him. He is my son.” How is this possible?

Answer: The surgeon is the boy’s mother.

22. A man pushes his car toward a hotel and suddenly realizes he has lost his fortune. Why?

Answer: He is playing Monopoly.

23. A short man lives on the tenth floor. Every morning he takes the elevator down. When he returns, he goes only to the eighth floor and walks up two floors. Why?

Answer: He is too short to reach the button for the tenth floor.

24. Three doctors say Robert is their brother. Robert says he has no brothers. How is this possible?

Answer: The three doctors are Robert’s sisters.

25. Two fathers and two sons go fishing. They catch three fish, and each person gets one. How many people are there?

Answer: Three: a grandfather, his son, and his grandson.

26. A woman looks at a photograph and says, “Brothers and sisters I have none, but this man’s father is my father’s son.” Who is in the photograph?

Answer: Her son.

27. A man is found hanging in a locked room. There is a puddle of water beneath him. What happened?

Answer: He stood on a block of ice, which later melted.

28. A man finds $20 on the ground but doesn’t keep it. Why?

Answer: It belonged to someone else, and he returned it.

29. A man claims someone broke his window from outside. The detective knows he is lying because most of the broken glass is outside. Why?

Answer: If the window had been broken from inside, more glass would generally be outside; the exact evidence depends on the scene. The riddle is designed around the direction of the broken glass.

30. A boat is full of people, but there isn’t a single person on board. How is this possible?

Answer: Everyone on the boat is married, so there isn’t a single person.

Mathematical Problem Riddles

31. What number comes next: 2, 4, 8, 16, 32, ?

Answer: 64.

32. I am an odd number. Take away one letter and I become even. What number am I?

Answer: Seven. Remove the “s” and it becomes “even.”

33. A farmer has 20 apples. He gives away half and then gives away two more. How many does he have left?

Answer: Eight.

34. A father is 40 years old and his son is 10. In how many years will the father be twice as old as his son?

Answer: 20 years. The father will be 60 and the son 30.

35. A farm has chickens and cows. There are 10 heads and 28 legs. How many chickens are there?

Answer: Six chickens and four cows.

36. A bag contains 10 red marbles and 10 blue marbles. Without looking, how many must you take to guarantee two of the same color?

Answer: Three.

37. If you multiply me by any number, I always remain the same. What number am I?

Answer: Zero.

38. What number comes next: 1, 3, 6, 10, 15, ?

Answer: 21. The differences are 2, 3, 4, 5, and 6.

39. If 5 machines make 5 items in 5 minutes, how long would 100 machines take to make 100 items?

Answer: Five minutes.

40. A mother is 24 years older than her child. In six years, she will be three times the child’s age. How old is the child now?

Answer: The child is 6 and the mother is 30.

Hard Problem Riddles

41. There are three boxes labeled Apples, Oranges, and Apples & Oranges. Every label is wrong. You may take one fruit from one box. How can you correctly label all three?

Answer: Take a fruit from the box labeled Apples & Oranges. Since all labels are wrong, that box must contain only apples or only oranges. Use that fruit to identify it, then determine the other two labels by elimination.

42. You have nine identical-looking coins, but one is heavier. Using a balance scale only twice, how can you find it?

Answer: Divide the coins into three groups of three. Weigh two groups. If one is heavier, the heavy coin is in that group; otherwise it is in the third group. Then weigh two coins from the suspected group to identify the heavier one.

43. Three travelers check into a hotel and pay $30. The hotel later realizes the correct price is $25. The clerk sends back $5, but the bellboy keeps $2 and gives each traveler $1. Where is the missing dollar?

Answer: There is no missing dollar. The travelers paid $27 after receiving $3 back. That $27 consists of $25 for the room plus $2 kept by the bellboy.

44. A prisoner must choose between two doors. One leads to freedom and one to danger. One guard lies and one tells the truth. What single question guarantees the correct choice?

Answer: Ask, “Which door would the other guard say leads to freedom?” Then choose the opposite door.

45. You have a building with three floors and a rope that takes exactly one hour to burn unevenly. How can you measure 30 minutes?

Answer: Light both ends of the rope simultaneously. Because both ends are burning, it will be completely burned in 30 minutes.

46. A man has two children. At least one is a boy. What is the probability that both children are boys?

Answer: Under the standard assumption that each child’s sex is independently equally likely and that “at least one is a boy” gives no additional information, the probability is 1/3.

47. Two trains leave different cities at the same time and travel toward each other. When they meet, which train is closer to the starting point of the other train?

Answer: Both are equally close to the other’s starting point.

48. A group must cross a bridge with one flashlight. Only two people can cross at once. The people take different amounts of time to cross. Why must the flashlight always be carried back?

Answer: Because anyone crossing the bridge needs the flashlight to see safely.

49. Three switches are outside a closed room. One controls a bulb inside. You may enter the room only once. What extra clue helps solve the puzzle?

Answer: The bulb produces heat. You can use the bulb’s temperature to identify the switch that was previously turned on.

50. A man has a problem that becomes smaller every time he shares it. What is it?

Answer: A problem or worry shared with someone who can help.

Problem riddles are a great reminder that solving a puzzle isn’t always about knowing the answer immediately. Sometimes the key is slowing down, questioning your assumptions, spotting patterns, and approaching the problem from a completely different angle. From simple logic challenges and number puzzles to tricky situations that require lateral thinking, these problem riddles offer something for every level of puzzler. Challenge yourself, compare your answers with friends, and keep practicing because every difficult puzzle you solve can make the next one a little easier.

Download Word Coach Application

FAQ’s