Question

A home has a living room that is 14 ft. wide, 22 ft. long, and a height of 9ft. Bob needs to paint

the room. He has to paint the walls and the ceiling. There are two 3.0 ft. by 5.0 ft. windows and
a 4.0 ft. by 7.0 ft. opening into the room. A gallon of paint covers 320 ft? How many gallons of
paint are needed? Explain how you reached your answer. (All data are accurate to two
significant figures.)

Answer 1

Explanation:

Let's find the volume of the room in ft³ and that will give

14×22×9=2772ft³

There are deductions. Hence we subtract them from this value

3×5=15, but there are two, hence 15×2=30ft²

And 4×7=28ft²

Hence 2772-(30+28)=2714

Dividing this value by 320 gives

8.4(to 2s.f)