The denominator of a fraction is 4 more than the numerator. If both the numerator and the denominator of the fraction are increased by 1, the resulting fraction is 1/2. Find the fraction.
d = n + 4
(n + 1) / (d + 1) = 1 / 2 ... 2 n + 2 = d + 1
substituting ... 2 n + 2 = n + 4 + 1 ... n = 3
d = 3 + 4 = 7
fraction is ... 3 / 7