physics

A gallon of paint will cover 300 ft2. How many gallons will you
need to paint a 12-ft x 18-ft wall with two coats of this paint?
(Round to nearest half gallon

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  1. Area of wall=12*18=216 sq.ft.
    Area two coats will cover
    = 2*216
    = 432 sq.ft
    Use proportions
    x gal./432 sq.ft = 1 gal./300 sq.ft
    Solve for x:
    x=(1/300)*432=1.44 gallons.

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