If you have a 30-gallon spray tank and the label calls for 3 pounds per acre with a delivery of 10 gallons per acre, how many pounds of product are required to use the entire tank?

• A. 6 pounds
• B. 9 pounds
• C. 12 pounds
• D. 15 pounds

Answer: (B)

To use the entire tank, relate the tank volume to the application rate per acre. You can treat a number of acres equal to the tank volume divided by the gallons applied per acre: 30 gallons ÷ 10 gallons per acre = 3 acres. At 3 pounds per acre, multiply by the acres you’ll treat: 3 acres × 3 pounds per acre = 9 pounds. So the 30-gallon tank would require 9 pounds of product. The other options would correspond to treating fewer acres (6 pounds for 2 acres, 12 pounds for 4 acres, 15 pounds for 5 acres), which isn’t what using the full tank at this rate yields.