SOLUTION: Suppose that a gallon of wall paint costs $40 and covers 150 sq ft. Three rooms of the house measure 10 ft by 12 ft, 12 ft by 14 ft and 12 ft by 16 ft. The ceiling is 11 ft high.

Question 110034: Suppose that a gallon of wall paint costs $40 and covers 150 sq ft. Three rooms of the house measure 10 ft by 12 ft, 12 ft by 14 ft and 12 ft by 16 ft. The ceiling is 11 ft high. Use this information and equations and formulass to answer the first 4 questions.
How many gallons of paint are needed to cover the wall of these rooms if you make no allowance for the doors and windows?
Just the walls not the ceilings?
Round up to next gallon since can't buy part of a gallon.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Find total area of the rooms

for the 1st room

2nd room

3rd room

The 2's are need because opposite walls are the same area
The 11's mean all the heights are the same
Find

Now factor out 11's and 2's

ft2
A gallon of paint covers 150 ft2
G = gallons needed

and since I can't buy part of a gallon,
I need 12 gallons of paint
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