Question

The number of boy and girl in a class in the ratio 9:8 the number of boy is 10 more than girl find total strength

Answer 1

Let's

Number of girls = X

Then according to question :-

Number of Boys = X + 10

Given ratio of Boy and girl are = 9:8

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Now

=> 9:8 = (x+10):x

$= > \frac{9}{8} = \frac{x + 10}{x} \\ \\ = > 9x = 8(x + 10) \\ \\ = > 9x = 8x + 80 \\ \\ = > 9x - 8x = 80 \\ \\ = > x = 80$
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hence,

Number of girls = 80

and

Number of Boys = 80+10 = 90

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So

Total strength = 80 + 90 = 170
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