With a product label calling for 5 quarts per 1000 sq ft at 2 gpa, how much product and water are needed to treat 500 sq ft?

With a product label calling for 5 quarts per 1000 sq ft at 2 gpa, how much product and water are needed to treat 500 sq ft?

• A. 2-1/2 quarts of product and 1/2 gallon water
• B. 2-1/2 quarts of product and 1 gallon water
• C. 5 quarts of product and 2 gallons water
• D. 1 quart of product and 1/2 gallon water

Answer: (B)

Rates on labels scale with area, so you adjust the amounts proportionally when treating a smaller area. The product rate is 5 quarts per 1000 sq ft, so for 500 sq ft you’re treating half the area, which uses half the product: 5 × 0.5 = 2.5 quarts. The water rate is 2 gallons per 1000 sq ft, so for 500 sq ft you also use half the water: 2 × 0.5 = 1 gallon. Therefore, you need 2-1/2 quarts of product and 1 gallon of water.

Rates on labels scale with area, so you adjust the amounts proportionally when treating a smaller area. The product rate is 5 quarts per 1000 sq ft, so for 500 sq ft you’re treating half the area, which uses half the product: 5 × 0.5 = 2.5 quarts. The water rate is 2 gallons per 1000 sq ft, so for 500 sq ft you also use half the water: 2 × 0.5 = 1 gallon. Therefore, you need 2-1/2 quarts of product and 1 gallon of water.