let numerator = x

denomenator = y

x+y=5

x/y> y

The question's wording is a bit vague... sounds like the denominator is 5 and the numerator is 1/2 the sum of denominator and numerator, giving:

x > =(x+5)/2

2x > =x+5

x > =5

5/5=1, so the number is anything greater than 1