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?

Explanation

The number of students in the school \(18 \times 35=630\). 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.

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