Question

In a survey, 480 people, or 75%, said they attended a movie at least once a month. How many people were surveyed?

Answer 1

This is a great problem to set up a proportion. We know that 480 people is 75% of some population, let's call it P. So we know that 480/P = 75/100 (because 75/100 is 75%). Therefore, we would solve 480/P=75/100, which would yield, 480*100=75P (cross multiplication). Then P=(480*100)/75. P=640.

Answer 2

480/3= 160
160 = 25%
160*4= 640
640 people were surveyed.