Ratio of number of boys to number of girls in a tutorial is $2 : 3.$ If there are $180$ girls ,then the number of boys is:

36

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60

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120

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100

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Solution

The correct option is B $120$
Boys to girls = $2 : 3$
Girls = $180$
Boys = $x$
$\frac{2}{3} = \frac{x}{180}$

$x = \frac{2 \times 180}{3} = 120$
Boys = $120.$

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