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

A. 25%

B. 27%

C. 35%

D. 67%

Correct Answer : A.


50% of (x-y)=30% of(x+y) ⇔ (50/100)(x-y)=(30/100)(x+y)         ⇔5(x-y)=3(x+y) ⇔ 2x=8y ⇔ x=4y

             therefore required percentage =((y/x) X 100)% = ((y/4y) X 100) =25%

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