Thirty boys and x girls sat for a rest. The mean of the boys scores and that of the girls were respectively 6 and 8. Find x if the total scores was 468

A.
38 
B.
24 
C.
36 
D.
22 
E.
41
Correct Answer: Option C
Explanation
Number of boy’s = 30
Number of girls = x
Mean of boys’ score = 6, for girls = 8
Total score for boys = 30 x 6
Total score for both boys and girls = 468
180 + 8x = 468
x = (frac{288}{8})
= 36