Question

During a recent blood drive, 9 donors had type O blood. This was 22.5% of the total number

of donors who gave blood that day. How many donors participated in the blood drive?

Answer 1

Answer: 40

Explanation:

Set up a proportion:

22.5/100 = 9/x

22.5x = 900

22.5x/22.5 = 900/22.5

x = 40

Answer: 40 people