Question

There are red and blue balls in a bag. The number of blue balls is 27 and the red balls are 4/7 of all balls. What is the total number of balls in the bag?

Answer 1

63.

Explanation:

The number of blue balls = (1 - 4/7) = 3/7 of all the balls.

So the total number of balls = 27 * 7/3

= 9 * 7

= 63 (answer).