How much product is required to prepare a 4% solution in a 3-gallon backpack sprayer?

To determine the amount of product needed to create a 4% solution in a 3-gallon backpack sprayer, it's important to first understand what a 4% solution signifies. A 4% solution means that there are 4 grams of the pesticide in every 100 milliliters of solution. However, in this case, we are working with gallons.

There are 128 ounces in a gallon. Therefore, for 3 gallons, the total volume of the solution would be:

3 gallons x 128 ounces/gallon = 384 ounces.

To calculate the amount of pesticide required for a 4% solution in this scenario, you multiply the total volume of the solution by the percentage (expressed as a decimal):

384 ounces x 0.04 = 15.36 ounces.

Thus, to achieve a 4% solution in a 3-gallon backpack sprayer, you would need to use 15.36 ounces of the product. This confirms that the selected answer aligns perfectly with the calculations used to derive the requirements for the solution concentration as specified.