There were 40 balls in the box. Out of every five balls, three were green and the rest were blue.

There were 40 balls in the box. Out of every five balls, three were green and the rest were blue. How many balls of each color were in the box?

1) If out of every five balls three were green, then 3/5 of the balls were green.
2) Find the number of green balls:
40 * 3/5 = 8 * 3 = 24 (balls);
3) Find the number of blue balls:
40 – 24 = 16 (balls);
Answer: green – 24 balls, blue – 16 balls.