Question

If 50% of (x - y) = 30% of (x + y). then what percent of x is y?

• A. 10 %
• B. 15 %
• C. 25 %
• D. 50 %

Answer 1

The correct option is C 25 %

$\frac{50}{100}\times (x-y)=\frac{30}{100}\times (x+y)$
$\frac{1}{2}\times (x-y)=\frac{3}{10}\times (x+y)$
$5x-5y=3x+3y$
$x=4y$
So required percentage $=\frac{y}{x}\times 100$
$\frac{y}{4y}\times 100=25Percent$