Question

$x$	$2$	$5$	$25$
$y$	$25$	$10$	$m$

If $x$ & $y$ are in inverse proportion, find m

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (B)

$2$

The given example is of inverse proportion.

by definition,

$x\propto \frac{1}{y}$ i.e. $x=K\frac{1}{y}$ , where $K$ is constant of proportionality

$\therefore xy=K$

$x\times y=2\times 25=50=K$

now, $25\times m=50$

$\therefore m=2$

Answer is option B