SOLUTION: a 500 gallon tank is being filled. Eighty gallons are in the tank after 6 minutes. how many minutes will it take to fill the tank?

Question 554028: a 500 gallon tank is being filled. Eighty gallons are in the tank after 6 minutes. how many minutes will it take to fill the tank?
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
80 gallons are poured into the tank in 6 minutes.
that means that the rate of pouring into the tank is 80/6 = 13.33333 gallons per minute.
at that rate it will take 37.5 minutes to fill the tank from empty.
since 6 minutes have already gone by, it will take an additional 31.5 minutes to fill the tank.
you can also show this as 420 gallons are left to fill at 13.33333 gallon per minute makes it take an additional 420/13.333333 minutes to fill the tank which equals 31.5 minutes.

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