Structural Pest Control Applicator Practice Exam

How much wettable powder should you add to a 450 gallon tank, given the instruction to add 3 pounds of WP per 100 gallons of water?

1. 10.5 pounds

2. 12 pounds

3. 13.5 pounds

4. 14.5 pounds

The correct answer is: 13.5 pounds

To determine the correct amount of wettable powder (WP) to add to a 450-gallon tank using the instruction of adding 3 pounds of WP per 100 gallons of water, you can use a simple proportion calculation. First, establish how many 100-gallon increments are in 450 gallons. You can do this by dividing 450 by 100: 450 gallons ÷ 100 gallons = 4.5 This means you have 4.5 increments of 100 gallons in a 450-gallon tank. Since the instruction is to add 3 pounds of WP for each 100 gallons, multiply the number of increments by the amount of WP per 100 gallons: 4.5 increments × 3 pounds of WP = 13.5 pounds of WP Thus, to treat a 450-gallon tank with the specified dosage, you should add 13.5 pounds of wettable powder. The calculation confirms that the correct answer is indeed 13.5 pounds.