Question

If 12 : $x$ : : 30 : 25, then the value of $x$ is

• A. 3
• B. 10
• C. 5

Answer 1

The correct option is B 10

12 : $x$ : : 30 : 25
$\Rightarrow$ $\frac{12}{x}$ = $\frac{30}{25}$
By cross-multiplication, we get
$\Rightarrow$ $12\times 25$ = $30\times x$
$\Rightarrow$ $2\times 2\times 3\times 5\times 5$ = $3\times 2\times 5\times x$
$\Rightarrow$ $x$ = 10