A label rate is 0.75 gallons per 1,000 sq ft. How many gallons are needed for 3,000 sq ft?

• A. 1.00 gallons
• B. 1.50 gallons
• C. 2.00 gallons
• D. 2.25 gallons

Answer: (D)

Think of the label rate as a direct proportion between area and gallons: 0.75 gallons cover every 1,000 square feet. To scale up to 3,000 square feet, use the same rate times how many thousands of square feet you have. 3,000 sq ft is 3 × 1,000 sq ft, so multiply by 3: 0.75 × 3 = 2.25 gallons. You need 2.25 gallons for 3,000 sq ft. This shows the quantity scales linearly with area—the larger the area, the more gallons in the same proportion.