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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.

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  1. 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

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