Question

What does it mean his average per game but it does not tell me how many games

Answer 1

The correct answer would be that if Dimitri improves his average by 1, he would have a 13.375 rebound per game average.

Although they don't tell you how many games he place, we can still solve. This is because we are adding an average to an average and therefore don't need to know totals.

12.375 + 1 = 13.375