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The ratio of boys and girls in a school is $12 : 5$ . If there are $840$ girls in the school, number of boys are

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answer is D.

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Detailed Solution

Let the number of boys

be 12 x

number of girls $= 5 x$

$5 x = 840$

$x = \frac{840}{5}$

$x = 168$

Number of boys $= 12 \times 168$ $= 2016$

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