How much wettable powder should be added to an 80-gallon tank if the instructions require 3 pounds per 100 gallons?

To determine how much wettable powder should be added to an 80-gallon tank when the instructions specify 3 pounds per 100 gallons, it's important to use a unit conversion method that allows you to scale down the requirement according to the size of the tank being used.

First, you start with the rate of application, which is 3 pounds per 100 gallons. Since you need to calculate the amount for an 80-gallon tank, you can set up a proportion:

• If 3 pounds are required for 100 gallons, then for 80 gallons, you can find the equivalent amount by multiplying:

[ \text{Required amount} = \frac{3 \text{ pounds}}{100 \text{ gallons}} \times 80 \text{ gallons} ]

This simplifies to:

[ \text{Required amount} = 3 \times 0.8 = 2.4 \text{ pounds} ]

This means that for an 80-gallon tank, you would need to add 2.4 pounds of wettable powder to meet the required concentration exactly. This calculation clearly illustrates how to scale the amount of product needed based on the volume of the tank, reinforcing the principle of proportionality in