###Human: There are 15 tables in the school's cafeteria. Each table can seat 10 people. Usually, only 1/10 of the seats are left unseated. How many seats are usually taken?, ### Assistant: The cafeteria can seat 15 x 10 = 150 people.
Usually, 150 x 1/10 = 15 seat are unseated.
Thus, 150 - 15 = 135 seats are usually taken. 
 So the answer is :  135