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24 January, 23:18

The sum of two numbers is 30 in the difference is 12 find The two numbers

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  1. 24 January, 23:33
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    Let's call the numbers x and y:

    their sum is:

    x+y=30

    and their difference is x-y=12.

    from the first equation: x=30-y

    and we insert this into the second equation:

    30-y-y=12.

    we calculate:

    30-2y=12

    30-12=2y

    18=2y

    9=y

    so the first number is 9 and the second is 30-9=21.
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