# A.2.8.3 Filling and Emptying Tanks

- Author:
- Katie Akesson

Tank A initially contained 124 liters of water. It is then filled with more water, at a constant rate of 9 liters per minute. How many liters of water, *W*, are in Tank A after the following amounts of time have passed?
a. 4 minutes
b. 80 seconds
c. *m* minutes

How many minutes have passed, *m*, when Tank A contains the following amounts of water?
a. 151 liters
b. 191.5 liters
c. 270.25 liters
d. *W* liters

What "moves" would you make to isolate *m* in the following equation:
124 + 9*m* = *W*

Tank B, which initially contained 80 liters of water, is being drained at a rate of 2.5 liters per minute. How many liters of water, *W*, remain in the tank after the following amounts of time?
a. 30 seconds
b. 7 minutes
c. *t* minutes

For how many minutes, *t*, has the water been draining when Tank B contains the following amounts of water?
a. 75 liters
b. 32.5 liters
c. 18 liters
d. *W* liters

What "moves" would you make to isolate *t* in the following equation:
*W = *80 - 2.5*t*