Question 217953
Let  n= numerator
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fraction originally  =  n/n+4
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adding  3  to  both  num  and den = (n+3)/(n+4+3) = (n+3)/(n+7)
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setting  this  equal  to  1/2
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(n+3)/(n+7) = 1/2,,,,,,cross  multiply
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2(n+3) =1(n+7)
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2n+6 = n+7
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n=1,,,,numerator
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denominator  =  n+4 = 5
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original  fraction = 1/5,,,,,,,,,answer
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check,,1/5,,,,(1+3)/(5+3) = 4/8 = 1/2 ,,,,,ok
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