How many integers between 300 and 500 have the sum of their digits equal to 16?

Answer 1

13 of them: 349, 358, 367, 376, 384, 394, 439, 448, 457, 466, 475, 484, 493.

Answer 2

We have to consider 2 cases:

When the hundreds digit is 3, we want the sum of the tens and unit digit equal to 13. We have 4+9=5+8=6+7=13, which yield a total of 6 choices (two for each pair that adds to 13).

When the hundreds digit is 4, we want the sum of the tens and unit digit equal to 12. We have 3+9=4+8=5+7=6+6=12. The first three pairs give us 2 solutions, but the last only gives 1, so we have a total of 7 choices.

Therefore there are total of 6+7=13 integers.