How many pounds of WP would be required for a 450-gallon tank if the rate is 3 pounds per 100 gallons?

To determine the amount of WP (wettable powder) needed for a 450-gallon tank at the specified rate of 3 pounds per 100 gallons, a calculation must be conducted to scale the rate accordingly.

First, calculate how many units of 100 gallons are in 450 gallons. This is done by dividing 450 by 100, which equals 4.5. This means that in a 450-gallon tank, there are 4.5 sets of 100 gallons.

Next, to find the total weight of WP required, multiply the number of units (4.5) by the rate (3 pounds per 100 gallons):

4.5 (units) × 3 (pounds) = 13.5 pounds.

This calculation clearly shows that for a 450-gallon tank, 13.5 pounds of WP is the correct amount needed at the specified application rate, making the choice of 13.5 pounds accurate. The context of using a specific rate per 100 gallons helps in understanding how to scale up the requirements according to the tank size, an important aspect in pest control and chemical application practices.