nathans fish tank holds 144 gallons of water. to clean the tank, he drains the water at a rate of 6 gallons per minute until the level is two-thirds its original level. how many minutes does it take to drain the tank for cleaning?
The tank is 144 gal and they wanna lower it to 2/3×144= 96 gal so the tank must drain 144-96= 48 gal if the tank drains at 6 gal per minute then 48/6= 8 minutes
