Question

The number of measles cases decreases by 9 percent to 508 cases. What was the number of cases before the decrease

Answer 1

558

Explanation:

The original number of cases of measles was x.

x was 100% of the number of cases of measles.

The number of cases then went down by 9%.

100% - 9% = 91%

The number of cases now is 91% of the original number, or 91% of x. We are told the number now is 508, so 91% of x must equal 508.

91% of x = 508

0.91x = 508

x = 508/0.91

x = 558.241...

Answer: 558