I am thinking of a number.i multiply it by 5 and add 139. I get the same number if I multiply by 13

Discussion in 'Calculator Requests' started by math_celebrity, Dec 10, 2019.

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  1. math_celebrity

    math_celebrity Administrator Staff Member

    I am thinking of a number.i multiply it by 5 and add 139. I get the same number if I multiply by 13 and subtract 13.What is my number?

    Take a number (n):

    The first operation is multiply 5 times n, and then add 39:
    5n + 139

    The second operation is multiply 13 times n and subtract 13:
    13n - 13

    Set both operations equal to each other since they result in the same number
    5n + 139 = 13n - 13

    Type this equation into our search engine and we get:
    n = 19
     

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