Two, whose digital sum is 5.
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999 are whole.
The two numbers whose sum is 58 and whose difference is 16 are 21 and 37.
100
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.
There are infinitely many. For example, 14,104,1004,10004,100004 etc.