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Tom has a water tank that holds 5 gallons of water. Tom uses water from a full tank to fill 6 bottles that each hold 16 ounces and a pitcher that holds 1/2 gallon. How many ounces of water are left in the water tank?

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sqdancefan
A gallon is 128 fluid ounces, so there were 640 ounces in Tom's full tank.

He filled a total volume of
.. 6*16 +(1/2)*128 = 96 +64 = 160 ounces
The tank has left
.. 640 -160 = 480 . . . . ounces of water

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