There are 9,000 residents in florida county aged from 50-59. That is 15% of the population. 15% is 15/100= .15 then you get 9,000 =.15x and the answer should be x=60,000.This pie chart shows 20 & under and 20-29 so you add them together you get 25%. 25% is .25 and then you get .25 x 60,000 then the answer should be 15,000.