8th grade math
posted by Anonymous on .
There are three walls in Jordan’s living room. The three walls, shown here, are 12 feet, 9 feet and 10 feet wide, respectively. Each wall has a height of 8 feet with a 6inch baseboard along the bottom. The largest of the three walls contains a window that measures 5 feet by 6 feet. Jordan plans to paint the three walls of his living room by mixing together some paint he already has, which includes white #2, magenta #3, red #4, yellow #5 and green #6. Jordan has decided to paint two of the walls a pale goldenrod and the third wall will be painted burnt umber.
Suppose that 1 gallon of paint is used to cover 400 sq feet. Jordan plans to apply four coats of the goldenrod paint mixture to the 12foot wall and the 9foot wall leaving only the window and baseboard unpainted. How many gallons of the goldenrod paint mixture will he need? Express your answer as a decimal to the nearest hundredth.

I will ignore all the jibberish about paint colour names and simply use colour A for the large wall and colour B for the other walls
area of large wall = 12(7.5)  5(6) = 60 square feet
area of other two walls = (9)(7.5) + 10(7.5) = 142.5 square feet
he will need 60/240 or .25 gallon of colour A for the large wall, which would be 1 quart
he will need 142.5/400 or .35625 gallons of colour B, so he needs 2 quarts of colour B
It seems silly to ask for accuracy to the nearest hundredth in the number of gallons needed.
Can you imagine walking into a paint store and asking for .356 of a gallon of paint? 
what is the ycoordinate of the point of intersection of the graphs of x+2y=6 and 2x+y=24?