Posted by **Hannah** on Sunday, May 26, 2013 at 8:56pm.

The floor of a bedroom is 12 feet by 15 feet and the walls are 7 feet high. One gallon of paint covers 450 square feet. How many gallons of paint do you need to paint the walls of the bedroom?

- geometry -
**Ms. Sue**, Sunday, May 26, 2013 at 8:58pm
How do you think this problem should be solved?

Remember: there are two walls of one size and two walls of another size.

- geometry -
**Hannah**, Sunday, May 26, 2013 at 9:04pm
12x 12 x15x15

- geometry -
**Ms. Sue**, Sunday, May 26, 2013 at 9:09pm
No. Picture each wall as a rectangle. Find the area of each wall.

What about the height of the walls?

- geometry -
**Hannah**, Sunday, May 26, 2013 at 9:15pm
12 x 15 x 7 =450

would it be 2.8 galloons

- geometry -
**Ms. Sue**, Sunday, May 26, 2013 at 9:20pm
Let's start over.

Two walls are 12 feet by 7 feet.

A = 2(12 * 7) = 168 square feet

Two walls are 15 feet by 7 feet.

A = 2 (15 * 7) = 210 square feet

210 + 168 = 378 square feet of walls

It sounds like just one gallon of paint will cover the four walls.

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