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30 December, 20:12

How many two digit whole numbers are increased by 18 when their digits are reversed?

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  1. 30 December, 20:46
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    To reverse by adding 18, the first digit must be smaller, and the second digit must be two greater.

    Start with

    13 - > 31

    24 - > 42

    35 - > 53

    46 - > 64

    57 - > 75

    68 - >86

    79 - > 97

    That should be all together 7 two digit whole numbers.
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