Question 12

Find the missing number in the box in each of the proportions:

$\frac{□}{18} = \frac{2}{9}$

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Solution

We have,
$\frac{?}{18} = \frac{2}{9} \Rightarrow \frac{?}{18} = \frac{2 \times 2}{9 \times 2}$ [Multiplying numerator and denominator by 2 to make denominator of both the ratios same]
$\Rightarrow \frac{?}{18} = \frac{4}{18}$
On comparing, we get, ? = 4

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