If 50% of (x – y) is equal to 30% of (x + y), then what percent of x is the value of y ?
0.5(x - y) = 0.3(x + y) gives 5x - 5y = 3x + 3y, so 2x = 8y and y = x/4. So y is 25% of x, which is none of 400%, 40% or 15%. 400% is the reverse ratio (x as a percentage of…
Choose your answer
If 50% of (x – y) is equal to 30% of (x + y), then what percent of x is the value of y ?
Answer and explanation
Correct answer D
0.5(x - y) = 0.3(x + y) gives 5x - 5y = 3x + 3y, so 2x = 8y and y = x/4.
So y is 25% of x, which is none of 400%, 40% or 15%. 400% is the reverse ratio (x as a percentage of y).
Practice for these exams
-
Uttarakhand PCS (Combined State Civil Services)