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.

Handshakes Between 7 People

How many handshakes occur when a group of 7 people shake hands exactly once with every other person in the group?

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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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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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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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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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