Interview Riddles

Interview riddles are famous questions asked during interviews by some big companies like Google, Microsoft, Intel etc.

Sum of Hats Puzzle

There are 3 people Abel, Bill and Clark. Three of them have numbers (positive integers) written on their hats. They can see the numbers on the other two hats but not their own. The number on one hat is the sum of the numbers on the other two hats. They are given this information and asked in turn if they can identify their number.

In the first round Abel, Bill and Clark each in turn say they don’t know. In the second round Abel is first to go and states his number is 50. What numbers are on Bill and Clark?

Riddle Answer