Question

If $\frac{9}{7}$ and $\frac{a}{63}$ are equivalent fractions, then the value of $a$ is _____.

• A. $72$
• B. $63$
• C. $81$
• D. $90$

Answer 1

The correct option is C $81$

If $\frac{9}{7}=\frac{a}{63}$,
Cross-multiplying, we get,
$9\times 63=a\times 7$
$⟹a=\frac{9\times 63}{7}=81$