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Let's solve this problem step by step.
Let's assume the number of games they played last season is x.
According to the problem, Ahmadullah's basketball team will play 21 games this season, which is 12 more than 1/3 the number of games they played last season.
1/3 of the number of games they played last season is (1/3)*x = x/3.
So, the equation becomes:
x/3 + 12 = 21.
To isolate x, we can subtract 12 from both sides:
x/3 = 21 - 12,
x/3 = 9.
To solve for x, we can multiply both sides by 3:
3*(x/3) = 3*9,
x = 27.
Therefore, Ahmadullah's basketball team played 27 games last season.