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Q.

The mean marks of 120 students of a school is 56. The mean marks of girls is 60 and that of boys is 50. If number of boys and girls are n and m respectively, then $\frac{9 n}{m}$ equals

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a

2

b

9

c

6

d

3

answer is D.

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Detailed Solution

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$n + m = 120 ..... (1)$

$56 = \frac{50 n + 60 m}{120} ....... (2)$

$(1) & (2) \to n = 48 & m = 72$

$∴ \frac{9 n}{m} = 6$

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