Question

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

Answer 1

1/2 (x-y)=3/10 (x+y)
10x - 10 y = 6x + 6y
4x = 16 y
x : y = 4 :1
z % of 4 = 1
z / 100 × 4 =1
z = 25%