Question

40% of a number is 120. What will 50% of the number be?

• A. 300
• B. 150
• C. 240
• D. 120

Answer 1

The correct option is B 150

$40\%$ of a number $=120$
$\frac{40}{100}$times the number $=120$
$\frac{40}{100}=\frac{120}{\text{the number}}$

Since the above fractions are equivalent, $40$ has to be multiplied with 3 to get 120 and also the denominator will be multiplied by $3$ to keep the ratio constant.

$\frac{40\times 3}{100\times 3}=\frac{120}{\text{the number}}$
$\frac{120}{300}=\frac{120}{\text{the number}}$
So, the number $=300$

And the $50\%$ of number will be:
$50$