Section: Mathematical Reasoning

51) A school has 18 classes with 35 students in each class. In order to reduce class size to 30, how many new classes must be formed?

1. 2
2. 3
3. 5
4. 6
5. 8

The number of students in the school 18 x 35 = 630. If there are to be 30 students in a class, the number of
classes needed is 630 / 30 = 21.

Therefore, the number of new classes needed is 21 - 18 = 3.