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Question 1094573: The first coat of paint for the outside of a building requires 1 liter of paint for each 10 meters squared. The second cost requires 1 liter for ever 15 meters squared. If the paint costs $4.75 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?
Answer by addingup(3677)   (Show Source):
You can put this solution on YOUR website! We'll assume that your building has no windows and no doors. It's just the 4 walls.
There are two sets of identical walls opposite one another, 2 walls are 12x6 and 2 walls are 20x6. And we are only painting the outside (one side) of the wall.
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(2 x 12 x 6) + (2 x 20 x 6) = 384 m^2 (square meters)
For the first coat:
384/10 = 38.4
have they told you if the painter can buy a fraction of a liter? Usually in this type of problems we assume that the paint comes in a container containing, in this case, 1 liter. So you can't ask the paint store to open a container and sell you 0.4 liters. You have to buy the whole liter.
If you have to buy the whole liter:
Need: 38.4 ---> buy 39 liters
39 x 4.75 = 185.25 this is for the first coat
384/15 = 25.6 ---> buy 26 liters
26 x 4.75 = 123.50 this is for the second coat
Add the cost of paint for the 1st and 2nd coats to get your answer.
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