North Carolina Pesticide Application Practice Test

If you have calibrated equipment to spray 50 gallons per acre, how much chemical formula do you need if the label indicates 3 pounds per 100 gallons?

1. 0.5 pounds

2. 1.5 pounds

3. 3 pounds

4. 0.75 pounds

The correct answer is: 1.5 pounds

To determine the correct amount of chemical formula needed for spraying at a calibration of 50 gallons per acre, we first consider the label instructions, which indicate using 3 pounds of the chemical per 100 gallons of solution. We can set up a proportion to find out how many pounds of chemical are necessary for 50 gallons: 1. Start with the rate from the label: 3 pounds per 100 gallons. 2. We want to find out how many pounds (X) we need for 50 gallons. Using the proportion: \[ \frac{3 \text{ pounds}}{100 \text{ gallons}} = \frac{X \text{ pounds}}{50 \text{ gallons}} \] To solve for X, cross-multiply: \[ 3 \times 50 = 100 \times X \Rightarrow 150 = 100X \] Now, divide both sides by 100 to isolate X: \[ X = \frac{150}{100} = 1.5 \text{ pounds} \] This calculation shows that for the calibrated amount of 50 gallons per acre, 1.5 pounds of the chemical formula is needed. Therefore, the correct answer is 1.