Two of them.
14 and 24
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.
Two integers.
20 number
999 are whole.
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.
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.
Two integers.
I believe here are 51 such numbers.
There are 5460 five digit numbers with a digit sum of 22.
20 number
999 are whole.
6
13 and 22
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.
13 and 22
The answer is 28
450.