Question

If$\frac{1}{8}+\frac{1}{9}=\frac{x}{10}$, The $72x$ is equal to

• A. $100$
• B. $90$
• C. $170$
• D. none of these

Answer 1

The correct option is C $170$

$\frac{1}{8}+\frac{1}{9}=\frac{x}{10}$

$\Rightarrow \left(\frac{9+8}{72}\right)=\frac{x}{10}$

$\Rightarrow \frac{17}{72}=\frac{x}{10}$

$\Rightarrow \frac{17\times 10}{72}=x=\frac{170}{72}$

Option $D$ is correct