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A certain brand of house paint must be purchased either in quarts at $12 each or in gallons at $18 each. A painter needs a 3-gallon mixture of the paint consisting of 3 parts blue and 2 parts white. What is the least amount of money needed to purchase sufficient quantities of the two colors to make the mixture?

 Apr 16, 2020
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There are 4 quarts in a gallon.

You need 3 gallons, which is 12 quarts.

Three-fifths of this must be blue and two-fifths of this must be white.

(3/5) x (12 qts)  =  7.2 quarts (which is almost 2 gallons)

(2/5) x (12 qts)  =  4.8 quarts (which is one gallon plus one quart).

 

Using these numbers, you can calculate the price.

 Apr 16, 2020

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