If 40% of (x - y) = 30% of (x + y), then y = what percent of x

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KPTCL Assistant Exam (Mescom) SLOT1 2017 click here to view all questions

If 40% of (x - y) = 30% of (x + y), then y = what percent of x ?

A70%

B 9.6%

C14.3%

D2.5%

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Answer is : 14.3% Explanation:  40% of (x - y) = 30% of (x + y) $=>\frac{40}{100} of (x-y) = \frac{30}{100} of (x+y)$ $=> \frac{40}{100}\times (x-y) = \frac{30}{100}\times(x+y)$ $=> 4x - 4y = 3x+3y$ => x = 7y $\therefore \text{required percentage} =\Big(\frac{y}{x}\times100\Big)\%$ => $\Big(\frac{y}{7y}\Big) \times 100 \%$ $=> \Big( \frac{100}{7} \Big) \%$ = 14.3%   rakesh ? answered Oct 18 '2017 at 21:35 All Comments

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