Question

The duplicate ratio of $\frac{3}{5}$ is ____

• A. $\frac{3}{5}$
• B. $\frac{6}{10}$
• C. $\frac{9}{25}$
• D. $\frac{\sqrt{3}}{\sqrt{5}}$

Answer 1

Answer: (C)

$\frac{9}{25}$

If a: b is a ratio, then its duplicate ratio is $\frac{a^2}{b^2}$

therefore duplicate ratio is

$ratio=\frac{3^2}{5^2}=\frac{9}{25}$