Question

There 400 students in sixth grade of these students 180 are boys what percent of sixth graders are girls.

Answer 1

To solve this, you need to subtract 180 from 400:  (400-180=220).  After that (I used the fraction/proportion/variable way, but there are others), so 220/400=%(p)/100.  Multiply diaganolly, so 400*p=400p, which is equal to 220*100=22000.  Therefore, 400p=22000.  Now, you have to isolate the variable by dividing both sides by 400: 400p/400=p, and 22000/400=55.  Therefore, p=55, or %=55, so the answer is 55%, or C.