Mary needs to paint four walls, each measuring 24.6 feet by 9.8 feet. Each gallon of paint covers 300 square feet of wall. What is the least number of gallons of paint Mary should buy?

1 Answer
Jun 8, 2018

At least #4# gallons

Explanation:

Since the walls are rectangular, we can compute their surface by multiplying their dimension. So,

#S = 24.6*9.8 = 241.08#

We have four walls, so the total surface is

#4S = 241.08 * 4 = 964.32#

Since every gallon of paint covers #300# square feet of surface, we need

#\frac{964.32}{300}=3.2144#

gallons of paint. If the answer must be an integer it would be #4#, since #3# gallons aren't enough as they cover #900# square feet.