Two integers.
The sum of the number of digits in all the numbers between 31 and 400 inclusive is 1041.
Two of them.
999 are whole.
20 number
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.
I believe here are 51 such numbers.
Two of them.
There are 5460 five digit numbers with a digit sum of 22.
20 number
999 are whole.
6
13 and 22
To find the even two-digit numbers where the sum of the digits is 5, we need to consider the possible combinations of digits. The digits that sum up to 5 are (1,4) and (2,3). For the numbers to be even, the units digit must be 4, so the possible numbers are 14 and 34. Therefore, there are 2 even two-digit numbers where the sum of the digits is 5.
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