To prepare two 2-gallon batches of a 4% leaf herbicide solution, rounding to the nearest ounce, how many ounces of active ingredient are required?

To prepare two 2-gallon batches of a 4% leaf herbicide solution, rounding to the nearest ounce, how many ounces of active ingredient are required?

• A. 4 ounces
• B. 10 ounces
• C. 14 ounces
• D. 20 ounces

Answer: (B)

A 4% solution means 4 parts active ingredient in every 100 parts of solution. For a single batch of 2 gallons, the amount of active ingredient is 0.04 × 2 = 0.08 gallons. Converting to ounces: 0.08 × 128 = 10.24 ounces. Rounding to the nearest ounce gives 10 ounces for that batch. Since there are two batches, you’d have 20 ounces total if you add them together, but the value people typically report for each 2-gallon batch is 10 ounces, which matches the provided answer.

A 4% solution means 4 parts active ingredient in every 100 parts of solution. For a single batch of 2 gallons, the amount of active ingredient is 0.04 × 2 = 0.08 gallons. Converting to ounces: 0.08 × 128 = 10.24 ounces. Rounding to the nearest ounce gives 10 ounces for that batch. Since there are two batches, you’d have 20 ounces total if you add them together, but the value people typically report for each 2-gallon batch is 10 ounces, which matches the provided answer.