What two numbers add up to 68?

Answer 1

There are infinitely many possible answers.

Select any number X, which may be positive or negative, rational or irrational (or even complex). And let Y = 68 - X.

Then the numbers X and Y will always sum to X + Y = X + 68 - X = 68.

Answer 2

Well, honey, it ain't rocket science. The two numbers that add up to 68 are 34 and 34. Simple math, darling. Now go on and enjoy the rest of your day!