What is the total amount of solution needed if an area of 90 feet by 60 feet is treated with one gallon per square yard?

To determine the total amount of solution needed for the treatment of an area measuring 90 feet by 60 feet with an application rate of one gallon per square yard, it is essential first to convert the area from square feet to square yards.

1. Calculate the area in square feet:

The area is calculated by multiplying the length by the width:

90 feet x 60 feet = 5400 square feet.

2. Convert square feet to square yards:

Since there are 9 square feet in 1 square yard, the conversion is done by dividing the total area in square feet by 9:

5400 square feet ÷ 9 = 600 square yards.

3. Determine the total amount of solution needed:

Given that the treatment requires one gallon per square yard, for 600 square yards, the total gallons required is equal to the square yard area:

600 square yards x 1 gallon/square yard = 600 gallons.

Thus, the total amount of solution needed is 600 gallons, confirming that the correct answer is aligned with this calculation.