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56.

Tens digit is greater than 4 and less than 6 so it can only be 5,

so the number is 5X.

It is one less than the number whose digits sum to 12, so its digits sum to 12-1 = 11

→ 5 + X = 11 → X = 11 - 5 = 6

→ the number is 56.

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Q: What is the number that is 1 less than the number whose digits have a sum of 12 and whose tens digit is greater than 4 but less than 6?
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