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8 September, 17:25

If the sum of the digits of a two-digit number is 7and the tens digit is one more than the ones digit, find the number.

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  1. 8 September, 20:28
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    Set the ones digit to x. 2x+1=7, so 2x=6, so x=3.

    x+1 is the tens digit, so the tens digit is 4 and the number is 43.
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