Math Riddles

These Math Riddles are based on math concepts and can be solved with a bit of math and logic. These fun riddles can surely give you a tough time.

Age of 4 Friends

In 12 years, 4 friends will be 100 years old in total. What will their total age be in 8 years?

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There are 4 keys and 4 locks. What is the maximum number of times you need to try the locks so as to match all 4 keys to their locks?

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A spider is trying to build a web for itself. The web built by it doubles every day.

If the spider completely built the web in 15 days, how many days did it take for the spider to build 25% of the web?

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Mr. Smith has two children. At least one of them is a boy. What is the probability that both children are boys?

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Three kinds of apples are mixed randomly in a box. How many apples must you take out to be sure of having at least two apples of one kind?

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