Question 364627
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Hi, 
Let x represent the numerator, then (x+6) would be the denominator
question states
{{{((x + 3)/(x+3+3)) = (5/7)}}}
{{{((x + 3)/(x+6)) = (5/7)}}}
cross multiply to solve for x
7(x+3) = 5(x+6) 
7x + 21 = 5x + 30
2x = 9
x = 9/2
checking our answer
{{{((15/2)/(21/2)) = 15/21 = 5/7}}}