If a lawn is 9,000 square feet, how many gallons are needed at 4 gallons per 1,000 square feet?

If a lawn is 9,000 square feet, how many gallons are needed at 4 gallons per 1,000 square feet?

• A. 30 gallons
• B. 34 gallons
• C. 36 gallons
• D. 40 gallons

Answer: (C)

The main idea is to apply the given rate to the total area by counting how many thousands of square feet are in the lawn. There are 9 blocks of 1,000 square feet in 9,000 square feet. At 4 gallons per block, multiply 9 by 4 to get 36 gallons. Quick check: 8,000 sq ft would need 32 gallons and 10,000 sq ft would need 40 gallons, so 9,000 sq ft requires 36 gallons. The result is 36 gallons.

The main idea is to apply the given rate to the total area by counting how many thousands of square feet are in the lawn. There are 9 blocks of 1,000 square feet in 9,000 square feet. At 4 gallons per block, multiply 9 by 4 to get 36 gallons. Quick check: 8,000 sq ft would need 32 gallons and 10,000 sq ft would need 40 gallons, so 9,000 sq ft requires 36 gallons. The result is 36 gallons.