Answer the following questions, using the dimensions above:

Question

 

Jonathan is painting a room with the following dimensions

2 walls with dimensions of 15 ½ ft. by 12 ft.

2 walls with dimensions of 25 ¼ ft. by 12 ft.
Ceiling with dimensions of 15 ½ ft. by 25 ¼ ft.
2 windows that are each 2 ft. by 4 ½ ft. as well as an 8-ft. by 5-ft. door

 

Answer the following questions, using the dimensions above:

What is the total wall area that needs to get painted?
What is the total ceiling area that needs to get painted?
If 1 gallon of paint covers approximately 400 square feet, how many gallons of paint will be needed to paint the walls with 2 coats?
How many gallons of paint will be needed to paint the ceiling with 2 coats?
How many total gallons of paint will be needed?
Compare the total cost of painting the room with paint from 2 different stores.
Go to a store's Web site to find the prices of paint.
To compare the prices, make sure that the paint is the same brand and color.
Make sure that you pick a color.
What is the difference in price between the two stores' pricing?

Answer 1

To find the total wall area that needs to be painted, you find the sum of the area for each wall and subtract the area of the windows and the door

 

Wall Area = 15.5 * 12 * 2 + 25.25 * 12 * 2 - 2 * 2 * 4.5 - 8 * 5

Wall Area = 371 + 606 - 17 - 40

Wall Area = 920 square ft

 

Ceiling Area is just the area of the ceiling

Ceiling Area = 15.5 * 25.25

Ceiling Area = 391.375

 

Since there are two coats, you need to cover 920 * 2 square feet for the walls which is 1840 square ft

Divide that by the amount each gallon can cover to get 4.6 gallons

 

For the ceiling, you need to cover 391.375 * 2 square feet which is 782.75 square feet

Divide that by the area each gallon can cover to get about 1.96 gallons

 

I think you have enough help to find the price of paint and finish the problem.