Question

If $\frac{3}{4}$ is equivalent to $\frac{x}{20}$ then the value of x is
(a) 15
(b) 18
(c)12
(d) none of these

Answer 1

(a) 15

Explanation:
$$\begin{gathered} \left(\frac{3}{4}=\frac{\mathrm{x}}{20}\right) \\ \mathrm{We}\mathrm{have}: \\ 20=4\times 5 \\ \mathrm{So},\mathrm{we}\mathrm{have}\mathrm{to}\mathrm{multiply}\mathrm{the}\mathrm{numerator}\mathrm{by}5. \\ \therefore \mathrm{x}=3\times 5=15 \end{gathered}$$