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Math & Logic · Ages 18+

Riddle #207

If it takes 5 people 5 hours to paint 5 identical fences, how long does it take 10 people to paint 10 identical fences, at the same steady rate?

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Answer: 5 hours

The ratio of people to fences stays 1:1, so each person still needs the same 5 hours to finish their own fence.

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More Math & Logic riddles for Ages 18+

#208 A father is currently 4 times as old as his son. In 20 years, he'll be exactly twice as old as his son. How old are they now?
#209 You reach a fork in the road: one path leads to the city, the other to certain ruin. Two guards stand there — one always tells the truth, one always lies, and you cannot tell which is which. You may ask exactly one yes-or-no question, to exactly one guard. What do you ask?
#210 Twenty-three people are picked at random and put in one room. Roughly what is the probability that at least two of them share a birthday?

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