According to Mrs. Cooper's class survey, 4 out of 7 students own a pool. The difference between the number of students that own a pool and those who don't is 7. How many students participated in the survey?

Answer 1

If x students own a pool, then
(x+7)/x = 4/3
find x, and then x+(x+7)

Answer 2

sorry. I meant

If x students do not own a pool, then ...