If the ratio of x to y is 3 to 5, then (y-x)/(x+y)?
Options.
A) -7/3 B) -2/8 C) 2/8 D) 1 E) 7/3
I believe this problem can be solved using algebra.   The ratio of x to y is 3 to 5 means   (x/y)=(3/5)   Cross-multiply   3x = 5y   x = (3/5)*y   Then, substitute x in the original equation in the problem with the value we just found.   (y - (3/5)*y) / ((3/5)*y + y)   = ((2/5)*y) / ((8/5)*y)   Simplify by canceling the y in the numerator with the y in the denominator.   (2/5) / (8/5)   = (2/5) * (8/5)   The 5s cancel each other out, and you are left with 2/8.
<result>C</result>
If the ratio of x to y is 3 to 5, then (y-x)/(x+y)?