How many gallons of pesticide are needed for 10 acres of land, applied at 2 lb pesticide per acre, using 4 lb pesticide per gallon?

To determine the correct amount of pesticide needed for 10 acres, we start by calculating the total pounds of pesticide required. If the application rate is 2 pounds per acre, for 10 acres, the calculation would be:

10 acres × 2 lb/acre = 20 lb of pesticide.

Next, to find out how many gallons of pesticide are required to supply that amount, we need to know how many pounds are contained in one gallon, which is given as 4 lb per gallon. Therefore, the number of gallons needed can be calculated by dividing the total pounds of pesticide by the pounds per gallon:

20 lb ÷ 4 lb/gallon = 5 gallons.

This correctly shows that for 10 acres, applying pesticide at the specified rates, a total of 5 gallons is needed. Understanding the step-by-step calculations is crucial in determining the correct answer and applying this knowledge to similar questions in Integrated Pest Management (IPM).