Ahmadullah's basketball team will play 21 games this season. That is 12 games more than 1-3 the number of games they played last season. How many games did they play last season? 27, 33, 11, or 7?
Let x be the number of games Ahmadullah's basketball team played last season.
They played 12 games more than 1-3x = x/3 games.
So, x + x/3 + 12 = 21.
Multiplying through the equation by 3 we get 3x + x + 36 = 63
Combining like terms, we get 4x = 27.
Dividing both sides of the equation by 4, we get x = 27/4 = 6.75
Therefore, Ahmadullah's basketball team played 6.75 = 7 games last season. Answer: \boxed{7}.