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You reduce each class by 5 (existing - new), and you have 18 classes (given).

Multiplying, you have 90 extra students. To put them in classes of 30, divide.

90 / 30 = 3 new classes.
Three more classes because 18*35 = 630 and 630/30 = 21

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Q: 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?
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