August 2024
Problem of the Month
Boxes of Red and Blue Balls
Submitted by K. Sengupta from Calcultta, India
There are six boxes containing 5, 7, 14, 16, 18, and 29 balls of either red or blue in colour.
Some boxes contain only red balls and the rest of them contain only blue.
A salesman sold one of the six boxes, and then he says, "I have the same number of red and blue balls left over."
Which box was sold?