Sunday, February 21, 2010

The first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..

of wall surface. The second coat requires 1 liter for every 15 m squared. If paint costs $3.50 per liter, what will be the cost of two coats of paint for the four outside walls of a building 20 m long, 15m wide, and 6 m high?The first coat of paint for the outside walls of a building requires 1 liter of paint for each 10 m squared ..
first find area of walls .


If 2 walls are 20 by 6 = 120 sq meters but 2 walls = 240


other 2 walls are 15 by 6 = 90, again 2 walls, so = 180


total surface area = 240 + 180 = 420


first coat 420/10 = 42 liters of paint @ 3.50 = $147


2nd coat 420/15 = 28 liters of paint @3.50 = 98


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TOTAL COST OF PAINT = $245

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