If 45% of (X -Y) = 30% of (X + Y), then what percent of X is Y?
If 45% of (X -Y) = 30% of (X + Y).
$$\frac{45}{100}\times(X-Y)=\ \frac{30}{100}\times\ (X+Y)$$
$$3\times(X-Y)=\ 2\times\ (X+Y)$$
3X - 3Y =Â 2X + 2Y3X - 2XÂ = 2Y +Â 3Y
X = 5YÂ Â Eq.(i)
Let's assume Z% of X is Y.
Z% of X = Y
Put Eq.(i) in the above equation.
Z% of 5Y = Y
$$Z\times\frac{5}{100}=1$$
$$Z\times\frac{1}{20}=1$$
Z = 20%
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