The class size increased 25% to 40 students. What was the originial class size?

We need to find 25% of 40, then subtract that number from 40 to find your answer, because the class increased by 25%.

Okay, let's find 25% of 40.

To do that, we need to multitasking the decimal form of 25% (0.25) by 40.

0.25*40=10

Okay, so now we know the class increased by 10 kids. Let's subtract those kids from the new class to find the original class number.

40-10=30

So, the original class size was 30 students.

Answer = 30 students