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29 August, 09:15

The sum of two numbers is 90. Their difference is 18. Find the numbers.

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  1. 29 August, 09:54
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    A+b=90, let b>a, so b-a=18

    from the first statement b=90-a, using this value of b in the second gives you:

    (90-a) - a=18

    90-2a=18

    -2a=-72

    a=36, and since b=90-a

    b=90-36=54. so the numbers are

    54 and 36
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