Solve the following real-world problem: Ahmadullah basketball team will play 21 games this season. That is 12 more games than 13 the number of games they played last season. How many games did they play last season?

Answer 1

Let x be the number of games Ahmadullah basketball team played last season.
The number of games they will play this season is x+12.
According to the problem x+12=21.
Subtracting 12 from both sides, we get x=9. Answer: \boxed{9}.