Question

$75\%$of what number is $15$

Answer 1

Let the number be $\mathrm{a}$

Then,

$\begin{array}{rcl}\frac{75}{100}\times \mathrm{a}& =& 15\\ \mathrm{a}& =& \frac{15\times 100}{75}\mathrm{By}\mathrm{transposing}\\ \mathrm{a}& =& 20\end{array}$

Hence, $75\%$of $20$ is $15$