There are 750 people at a football game. out of this number, 320 are students. what percent of the people at the football game are not students? round to the nearest tenth if needed?

To do this problem you use is/of=percent/100
So:
320/750=x/100
cross multiply 
32,000=750x
divide both sides by 750
x=42.66 repeating

ANSWER: X=42.66 REPEATING

You need to use this equation:
part of the whole = percentage x whole (simpler, it is a=pw)
In this case, it would be
320 = p x 750
Because p is the percentage we are trying to find.
You would then divide both sides by 750 to isolate p.
320 divided by 750 is 0.4266, and rounding to the nearest tenth it would be 0.43. Now your equation is
0.43 = p
To make it a percentage you move the decimal to the right two times. That makes your equation
43 =p
So 43% of the people at the football game are not students.