152 ÷ 4/ 15 = 570 (volume)

The answer is very detailed:

Class 2 donated the average of three classes, which is 1/3 of the total.

Class 3 donated 2/5 of the total.

So 1 donated a total of1-1/3-2/5 = 4/15.

4/ 15 of the total is 152, so a total of 570 copies were donated.