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30 March, 17:37

What is the sum of two numbers is 45 and theire difference is 5

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  1. 30 March, 19:50
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    let the two numbers be x and y

    x+y=45 (equation 1)

    x-y=5 (equation 2)

    from equation (1) y=45-x (equation 3)

    substitute 45-x for y in equation 2

    x - (45-x) = 5

    x-45+x=5

    x+x-45=5

    2x-45=5

    2x=45+5

    2x=50

    x=50/2

    x=25
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