Question 11

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

$\frac{3}{5} = \frac{□}{20}$

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Solution

We have,
$\frac{3}{5} = \frac{?}{20} \Rightarrow \frac{3 \times 4}{5 \times 4} = \frac{?}{20}$ [Multiplying numerator and denominator by 4 to make denominator of both the ratios same]
$\Rightarrow \frac{12}{20} = \frac{?}{20}$
On comparing, we get, ? = 12

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