Question

If $x$ and $y$ vary inversely as each other, and $x=10$ when $y=6$. Find $y$ when $x=15$.

• A. $2$
• B. $4$
• C. $8$
• D. $5$

Answer 1

The correct option is B $4$

Since $x$ and $y$ vary inversely as each other, therefore the product $xy$ always remains constant.

$10\times 6=15\times y$

$\Rightarrow 60=15y$

$\Rightarrow y=\frac{60}{15}$

$\Rightarrow y=4$