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The sum of the digits of a two-digit counting number was 13. When the digits were reversed, the new number was 9 less than the original number. What was the original number?
so the number is xy ( this doesn't mean x times y) x+y=13 yx=xy-9 the digits cannot be the same they must add up to 13 so they cannot be positive so the number pairs are single digits so 9+4 8+5 7+6 the possible numbers pairs are 94 and 49 85 and 58 76 and 67 we find the differences 94-49= greater than 9 85-58= greater than 9 76-67=9
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