A public official wants to donate 5 new soccer balls per each class in two schools. Each school has 4 elementary school classes and 5 middle school classes. How many soccer balls would the public official donate in all?
Use reasoning to answer the following question.
90
Each school has 4 + 5 = 9 classes.

So, there are a total of 9 x 2 = 18 classes for the 2 schools.

Therefore, the public official donates a total of 18 x 5 = 90 soccer balls.

.

Thus, the answer is 90