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8 August, 17:48

The sum of two numbers is 40 and their difference is 6.5 what is their product

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  1. 8 August, 18:15
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    Let x = first number, and y = second number.

    x + y = 40 (1)

    x - y = 6.5 (2)

    Rearrange (2)

    y = x - 6.5 (3)

    Sub (3) in (1)

    x + (x - 6.5) = 40

    2x - 6.5 = 40

    2x = 33.5

    x = 16.75 (4)

    Sub (4) in (1)

    16.75 + y = 40

    y = 23.25

    x * y = 16.75 * 13.25 = 221.9375

    The product is 221.9375
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