<PRE><B>Question 169763</B>
Calculate the number of gallons of paint required to paint the outside walls of a barn that measures 50 feet by 100 feet. Each wall is 12 feet high and each gallon of paint covers 600 square feet. 
The answer I came up with is 8.3 which is wrong.
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I think you used 50*100, which is the area of the floor.
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Find the area of the walls.  Two are 12 by 50 = 600 sf each.  The other 2 are 12 by 100 = 1200 sf each.
The total is 2*600 + 2*1200 = 3600 sq feet
3600/600 = 6 gallons.

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