The label on a gallon of interior wall paints reads "Coverage: 400 square feet." If a wall is 8 feet high, what maximum length of wall could be painted by 1 1/2 gallons?
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one gallon can cover 400 sqft.
so 1 1/2 gallons can cover = 400 x 1.5
= 600 sqft.
consider the wall length = l
wall area = cover area
l x 8 = 600
so l = 600/8
l = 75 feet
the length is = 75 feet
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