2 + 16
4 + 14
6 + 12
8 + 10
4 pairs of even numbers can be found whose sum is eighteen.
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There are two pairs of even numbers that satisfy the condition. They are (8, 10) and (6, 12).
100
12 14
Infinitely many. However, if you don't want negative numbers, the lower of the two numbers must be at least 0, and at most 22. The higher of the two numbers, of course, will be 46 minus the first number. Perhaps you can work it out from there.
The numbers are 38, 40 and 42.
-- There are 11 even numbers that are less than 1/2 of 46. -- Each of those can be paired with another even number that is more than 1/2 of 46. -- So there are 11 possibilities.