There are infinitely many numbers.
For example:
4, 40, 400, 4000, and so on.
or
31, 301, 310, 3001, 3010, 3100, 30001, 30010, 30100, 31000 and so on.
and then 22, 211, 13, 121, 112 and 1111 with 0s between their digits.
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-11
There are no 3-digit whole numbers whose digits sum to 3. The smallest 3-digit number is 100, and the largest is 999, but in neither case is the sum of the digits equal to 3.
18
279,999,720
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.