Question

Each gallon of paint covers 400 square feet. i have to paint one side of a wall that is 8 meters tall and 40 meters long. if a foot is approximately 0.3048 meters, then what is the smallest whole number of gallons i can buy and have enough paint to cover the whole wall?

Answer 1

1. You have that:
 
 - Each gallon of paint covers 400 ft².
 - One side of a wall must be painted and its dimensions are :is 8 meters tall and 40 meters long.
 
 1 ft=0.3048 m
 1 ft²=(0.3048 m)²=0.09290 m²
 
 2. Each gallon of paint covers 400 ft², then:
 
 400 ft²x0.09290=37.16 m²
 
 3. The area of one side of the wall is:
 
 A=8 mx40 m
 A=320 m²
 
 4. Therefore, you have:
 
 1 gallon-----37.16 m²
             x-----320 m²
 
 x=320x1/37.16
 x=8.61 gallons
 x≈9 gallons
 
 The answer is: 9 gallons