In a survey, 480 people, or 75%, said they attended a movie at least once a month. How many people were surveyed?
A. 405 people
B. 360 people
C. 555 people
D. 640 people

Question

In a survey, 480 people, or 75%, said they attended a movie at least once a month. How many people were surveyed?
A. 405 people 	
	B. 360 people 	
	C. 555 people 	
	D. 640 people

anonymous · Answer

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.  HTH!