SOLUTION: Mr. Quinton submitted the grades of his pupils in the following manner:Two-thirds got A's, 1/5 B's and the remaining 4 pupils got C's. How many pupils are there in Mr. Quinton's cl

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Question 532469: Mr. Quinton submitted the grades of his pupils in the following manner:Two-thirds got A's, 1/5 B's and the remaining 4 pupils got C's. How many pupils are there in Mr. Quinton's class
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
Let the number of pupils in the class be x.
%282%2F3%29%2Ax got A's
%281%2F5%29x got B's
Those number plus the 4 remaining students add up to the whole class
%282%2F3%29x%2B%281%2F5%29x%2B4=x
%2813%2F15%29x%2B4=x
4=x-%2813%2F15%29x
4=%282%2F15%29x
x=4%2815%2F2%29 so x=30