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28 July, 20:08

The tens digit of a two digit number excedds the unit digit by 5. if they are reversed b the new number is less by 45. if the v sum of their digits is 9 find the numbers

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  1. 28 July, 20:42
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    X and y are digts

    x is tens y is ones

    x=y+5

    10y+x=10x+y-45

    x+y=9

    we have

    x+y=9

    x=y+5

    sub

    y+5+y=9

    2y+5=9

    minus 5

    2y=4

    divide 2

    y=2

    sub back

    x=y+5

    x=2+5

    x=7

    the number is 72
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