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What is the strategy for my number has 2 hundred the ten digit is 9 more than the ones digit

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Anaivis
If the number has 2 hundreds we know the first digit is 2. So far our answer is 2__. If the tens digit is 9 more than the ones digit than the only possible answer would be 290 because 9 more than 0 is 9. So the final answer is 290.