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30 January, 03:36

The tens digit of a certain number is five more than the units digit. The sum of the digits is 9. Find the number.

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  1. 30 January, 07:07
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    the tens digit = n

    the units digit = n-5

    n + n-5 = 9

    2n = 9+5

    2n = 14

    n = 7 ← the tens digit

    the units digit = n-5 = 7 - 5 = 2

    the number is 72
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