In a class, the average score of boys in an examination is 86 and that of girls is 81. If the average score of the whole class is 83, then what percent of the class are the girls?
A. 40%
B. 50%
C. 60%
D. 65%
E. None of these
সঠিক উত্তরঃ
C.
60%
Explanation:
There are X boys and Y girls. (X86+Y*81)/(X + Y) = 83 86X+81Y83X+ 83Y 3X=2Y X: Y = 2:3
Percentage of girls = 3/5*100
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