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Quantitative Aptitude

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Percentage & Averages

Question
15 out of 30
 

The average marks scored by the student of a class are 70. The average marks of girl in a class are 80 and boy is 65. What is the percentage of boys in the class?



A 50
B 25
C
D 60
E None of these

Ans. C Let boy = x

And girl = y

(x+y) × 70 = 80x + 65y

70x + 70y = 80x + 65y

10x = 5y

Y = 2x

X + y = 3x

So boy% =

Percentage & Averages Flashcard List

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