Question

Carla saw a license plate

with 3 numbers and some
letters. The sum of the numbers
is 20. What could the 3 numbers
be?

Answer 1

Explanation:

Comment

Since you make no other restrictions, the numbers can have duplicates.

9 + 9 + 2 is one possibility.

9 + 7 + 4 is another

9 + 8 + 3

and another 33 possibilities. Surely you are not expected to list them all. Three should be enough.