if 70% of (x-y) = 30% of (x+y) then what percent of x is y? Choose the correct choice from the following answers:
A) 2.5%  B) 40%  C) 5%  D) 15%  E) 25%
70% of (x-y)=30% of(x+y)   (70/100)(x-y)=(30/100)(x+y)   7(x-y)=3(x+y)   4x=10y   x=5/2y   therefore required percentage   =((y/x) X 100)% = ((y/(5/2)y) X 100) =40%   Answer is 40%.
<result>B</result>
if 70% of (x-y) = 30% of (x+y) then what percent of x is y?