If the ratio of x to y is 2 to 6, then (y-x)/(x+y)?	Pick.
A) -7/3  B) -3/7  C) 1/2  D) 1/4  E) 7/3
I believe this problem can be solved using algebra.   The ratio of x to y is 2 to 6 means   (x/y)=(2/6)   Cross-multiply   2x = 6y or 1x=3y   x = (1/3)*y   Then, substitute x in the original equation in the problem with the value we just found.   (y - (1/3)*y) / ((1/3)*y + y)   = ((2/3)*y) / ((4/3)*y)   Simplify by canceling the y in the numerator with the y in the denominator.   (2/3) / (4/3)   = (2/3) * (4/3)   The 3s cancel each other out, and you are left with 2/4 to 1/2.
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If the ratio of x to y is 2 to 6, then (y-x)/(x+y)?