A gallon of stain covers 200 sq ft. How many gallons are needed for 2 coats of on deck that is 20ft by 45ft?

A = LW

A = 20 * 45

A = 900 sq. ft

(900 * 2) / 200 = ____________ gallons needed

Get your square footage of the room (20*45)=900 and then multiplying it by 2 we get 1800 sq. ft. One gallon will cover 200 sq. ft. so then we divide the aquare footage we need to cover by the 200 and we get 9 gallons.

To find out how many gallons are needed for 2 coats of stain on a deck, we first need to calculate the total square footage of the deck that needs to be covered.

The formula to calculate the area of a rectangle (such as a deck) is:
Area = length x width

In this case, the length of the deck is given as 20ft and the width is given as 45ft.

Therefore, the total square footage of the deck is:
Area = 20ft x 45ft = 900 sq ft

Since we want to apply 2 coats of stain, the total square footage that needs to be covered is doubled:
Total Area = 900 sq ft x 2 = 1800 sq ft

Now, we know that one gallon of stain covers 200 sq ft. To determine the number of gallons needed, we can divide the total square footage by the coverage per gallon:
Number of gallons = Total Area / Coverage per gallon

Number of gallons = 1800 sq ft / 200 sq ft = 9 gallons

Therefore, you would need 9 gallons of stain for 2 coats on a deck that is 20ft by 45ft.