Which amount of formulation should be added to the tank to prepare 50 gallons of finished spray given the rate 3 pounds per 100 gallons of water?

• A. 0.75 pounds
• B. 1.5 pounds
• C. 2.5 pounds
• D. 3.0 pounds

Answer: (B)

Scaling the formulation by the finished spray volume is what this item tests. The rate of 3 pounds per 100 gallons means you use 0.03 pounds of product for every single gallon of spray.

To prepare 50 gallons, multiply the per-gallon amount by the volume: 0.03 pounds/gallon × 50 gallons = 1.5 pounds.

You can also see this with a proportion: 3 pounds per 100 gallons equals x pounds per 50 gallons, so x = (3 × 50) / 100 = 1.5 pounds.

So the correct amount to add is 1.5 pounds. The other options would correspond to different volumes (for example, 0.75 pounds would be for 25 gallons, 3.0 pounds for 100 gallons, etc.).