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.

Two Hourglasses

You have two hourglasses, a 7 minute one and an 11 minute one. Using just these two hourglasses, how can you accurately time 15 minutes?

Riddle Answer

Twelve Flags

Twelve flags stand equidistant along the track at the stadium. The runners start at the first flag. A runner reaches the eighth flag 8 seconds after he starts. If he runs at an even speed, how many seconds does he need altogether to reach the twelfth flag?

Riddle Answer

Two Trains Puzzle

A nonstop train leaves Moscow for Leningrad at 60 miles per hour. Another nonstop train leaves Leningrad for Moscow at 40 miles an hour. How far apart are the trains 1 hour before they pass each other?

Riddle Answer

Book Price

A book costs $1 plus half its price. How much does it cost?

Riddle Answer

Half as Many Sisters as Brothers

A boy has as many sisters as brothers, but each sister has only half as many sisters as brothers. How many brothers and sisters are there in the family?

Riddle Answer