These are the riddles that go round: the ones that arrive in a group chat with "90% of people get this wrong" attached, start an argument, and never quite get resolved because nobody posts the answer.

Here they are with the answers. Where a viral riddle is genuinely ambiguous - and several of the famous ones are - the explanation says so and gives both readings, which is usually what the argument was about in the first place.

13.MediumGood Riddle

A murderer is condemned to death. He has to choose between three rooms. The first is full of raging fires, the second is full of assassins with loaded guns, and the third is full of lions that haven't eaten in 3 years. Which room is safest for him?

  • A.The first room
  • B.The second room
  • C.None are safe
  • D.The third room, because those lions haven't eaten in three years, so they are dead.
Answer: The third room, because those lions haven't eaten in three years, so they are dead.

Lions that haven't eaten in three years would have starved to death long before now, so the 'lion-filled' third room actually poses no danger at all.

Full explanation and related riddles

22.HardGood Riddle

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

  • A.They lied about their age
  • B.They had a birthday reversal
  • C.It's a leap year error
  • D.The person was born in 2005 B.C. (Before Christ). Therefore, he was 5 years old in 2000 B.C., 10 in 1995 B.C., and 15 in 1990 B.C.
Answer: The person was born in 2005 B.C. (Before Christ). Therefore, he was 5 years old in 2000 B.C., 10 in 1995 B.C., and 15 in 1990 B.C.

The years given are B.C. dates, which count downward, so a birth in 2005 B.C. makes the person 15 in 1990 B.C. and 10 in 1995 B.C.

Full explanation and related riddles

40.HardGood Riddle

An apple is 40 cents, a banana is 60 cents and a grapefruit is 80 cents. How much is a pear?

  • A.60 cents
  • B.20 cents
  • C.80 cents
  • D.40 cents. The price of each fruit is calculated by multiplying the number of vowels by 20 cents.
Answer: 40 cents. The price of each fruit is calculated by multiplying the number of vowels by 20 cents.

Each fruit's price equals its number of vowels times 20 cents -- apple (2 vowels) = 40c, banana (3 vowels) = 60c, grapefruit (4 vowels) = 80c, and pear (2 vowels) = 40c.

Full explanation and related riddles

69.MediumBest Riddle

I come in different colors and shapes. Some parts of me are curvy, some are straight. You can put me anywhere you like, but there is only one right place for me. What am I?

  • A.A key
  • B.A magnet
  • C.A sticker
  • D.A jigsaw puzzle piece
Answer: A jigsaw puzzle piece

Jigsaw puzzle pieces come in varied colors and shapes with curved and straight edges, and although they can physically fit various spots, only one location completes the picture correctly.

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Frequently asked questions

Usually because the wording genuinely supports two answers, and each side can see only their own. Our explanations name both readings where that is the case.

Almost never. It is a share hook, not a statistic.