A calculation problem: malathion rate 3/4 quart per acre; tank 300 gallons; 30 gallons per acre; How much malathion is needed per tank of spray mixture?

A calculation problem: malathion rate 3/4 quart per acre; tank 300 gallons; 30 gallons per acre; How much malathion is needed per tank of spray mixture?

• A. 5 Quarts
• B. 7.5 Quarts
• C. 10 Quarts
• D. 15 Quarts

Answer: (B)

The key idea is to link the application rate to the area treated by one tank of spray. The sprayer uses 30 gallons of spray per acre, and the tank holds 300 gallons, so it covers 300 ÷ 30 = 10 acres. Malathion is applied at 3/4 quart per acre, which is 0.75 quart per acre. For 10 acres, the total malathion needed is 0.75 × 10 = 7.5 quarts. So, about 7.5 quarts are required per tank.

The key idea is to link the application rate to the area treated by one tank of spray. The sprayer uses 30 gallons of spray per acre, and the tank holds 300 gallons, so it covers 300 ÷ 30 = 10 acres. Malathion is applied at 3/4 quart per acre, which is 0.75 quart per acre. For 10 acres, the total malathion needed is 0.75 × 10 = 7.5 quarts. So, about 7.5 quarts are required per tank.