A wooden fence 6 ft. high and 300 ft. long is to be painted on one side. How many gallons of paint are needed if one gallon covers 400 sq. ft.?

First, you should calculate the square footage of the fence. 6ft∗300ft=1800ft2 Then to find the number of gallons of paint needed, divide the area of the fence by the area covered with each gallon of paint: 1800ft2:400ft2=4.5 So, 4.5 gallons of paint, or rounding up, 5.