Question

if 50% of (x-y) = 30% of (x + y),then what percent of x is y

Answer 1

50% of (x-y) = 30% of (x + y)
50(x -y)/100= 30(x+y)/100
5(x -y)=3(x+y)
5x-5y = 3x +3y
5x-3x =3y+5y
2x=8y
x=4y
x=400/100 y
i.e. x = 400% of y