Question

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

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Solution

## Let the number be $\mathrm{a}$Then, $\begin{array}{rcl}\frac{75}{100}×\mathrm{a}& =& 15\\ \mathrm{a}& =& \frac{15×100}{75}\mathrm{By}\mathrm{transposing}\\ \mathrm{a}& =& 20\end{array}$Hence, $75%$of $20$ is $15$

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