Question

An empty bathtub is filled with water at a rate of 2.5 liters per minute. How long will it take to fill the bathtub with 30 liters of water?

Answer 1

answer is 12 minutes

Answer 2

Let x = number of minutes ( 2.5 liters/min )*(x) = 30 liters          x = (30 liters) / (2.5 liters/min)          x = 30/2.5 min      [note how liters cancel]          x = 12 min Check:  Is  2.5*12 = 30   ?        30 = 30