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?
Thoughts? Step-by-step reasoning:
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.
Thus, the answer is 135.