numerator of a fraction is 5 less than its denominator. if 1 is added to the numerator and to the de

Discussion in 'Calculator Requests' started by math_celebrity, Oct 2, 2021.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    numerator of a fraction is 5 less than its denominator. if 1 is added to the numerator and to the denominator the new fraction is 2/3. find the fraction.

    Let n be the numerator.
    Let d be the denominator.

    We're given 2 equations:
    1. n = d - 5
    2. (n + 1)/(d + 1) = 2/3
    Substitute equation (1) into equation (2) for n:
    (d - 5 + 1) / (d + 1) = 2/3
    (d - 4) / (d + 1) = 2/3

    Cross multiply:
    3(d - 4) = 2(d + 1)

    To solve this equation for d, we type it in our search engine and we get:
    d = 14

    Substitute d = 14 into equation (1) to solve for n:
    n = 14 - 5
    n = 9

    Therefore, our fraction n/d is:
    9/14
     

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