Question

The ratio of the number of boys to the number of girls in a tutorial is 2:3. If there are 180 girls, what is the number of boys?

• A. 36
• B. 60
• C. 120
• D. 100

Answer 1

The correct option is C

120

Ratio of number of boys to number of girls = 2:3
Number of girls = 180
Let the number of boys be x.
$\Rightarrow$ $\frac{2}{3}=\frac{x}{180}$ $[\because$ they are equivalent ratios]
$\Rightarrow$ $3x=2\times 180$
$\Rightarrow$ $x=\frac{360}{3}$
$\Rightarrow$ $x=120$
$\therefore$ Number of boys are 120.