How much wettable powder should be added to a 450-gallon tank if the recommendation is 3 pounds WP per 100 gallons?

To determine the correct amount of wettable powder (WP) to add to a 450-gallon tank when the recommendation is 3 pounds per 100 gallons, you need to calculate the total amount based on the total volume of water.

First, find out how many 100-gallon units are in 450 gallons. You can do this by dividing 450 gallons by 100 gallons:

450 gallons ÷ 100 gallons = 4.5

Now that you know there are 4.5 units of 100 gallons in 450 gallons, you multiply this number by the recommended amount of wettable powder, which is 3 pounds per 100 gallons:

4.5 units × 3 pounds/unit = 13.5 pounds

This calculation shows that you should add 13.5 pounds of wettable powder to a 450-gallon tank according to the specified rate. Therefore, the correct answer is 13.5 pounds.

Understanding the calculation process is key; it allows for adjustments in the amount of wettable powder depending on different volumes, ensuring that proper application rates are followed for effective pest management.