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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?
They are taught. Perhaps you cut classes when they were.
80
You would first multiply 35 x 18 to find out how many total students there are, which is 630. Then, you would divide 630/30, since you can only have 30 students maximum in a class. This gives you the answer of 21 classes must be formed.
There is an excess of 18 x 5 ie 90 so there has to be an extra 3 classes.