If 50% of (x − y) equals 30% of (x + y), then what percentage of x is y?
25% of x is y. Expanding 0.5(x − y) = 0.3(x + y) gives 0.2x = 0.8y, so y/x = 1/4 and y is 25% of x.
Choose your answer
If 50% of (x − y) equals 30% of (x + y), then what percentage of x is y?
Answer and explanation
Correct answer D
25% of x is y. Expanding 0.5(x − y) = 0.3(x + y) gives 0.2x = 0.8y, so y/x = 1/4 and y is 25% of x.
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