Question

Find x, if the ratios 25g : 30g and 40 kg : x are in proportion.

• A. 42 kg
• B. 48 kg
• C. 56 kg
• D. 62 kg

Answer 1

The correct option is B 48 kg

25 g : 30 g = $\frac{25}{30}$ = 5 : 6
40 kg : x kg = $\frac{40}{x}$
If the ratios 25 g : 30 g and 40 kg : x kg are in proportion then
5 : 6 = 40 : x
$\frac{5}{6}$ = $\frac{40}{x}$
5x = 6 $\times$ 40
x = $\frac{(6\times 40)}{5}$
x = 48 kg