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Mathematics 21 Online
OpenStudy (anonymous):

The first coat of paint for the outside of a building requires 1 liter of paint for each 10 square meters. The second coat requires 1 liter for every 15 square meters. If the paint costs $4.55 per liter, what will be the cost of two coats of paint for the four outside walls of a building 20 meters long, 12 meters wide, and 6 meters high?

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