A label calls for a granular pesticide to be applied at 8 ounces per 1,000 feet of row. You have to treat 4 rows, each mile in length. How much product do you need for this job?

• A. 21 ounces
• B. 32 ounces
• C. 42 ounces
• D. 62.5 ounces

Answer: (C)

The key idea is to convert the total length of row into feet, then apply the rate per 1,000 feet and scale up to the total feet you must treat.

Each row is 1 mile long, which is 5,280 feet. For four rows, the total length to treat is 4 × 5,280 = 21,120 feet. Since the label calls for 8 ounces per 1,000 feet, think in thousands of feet: 21,120 feet is 21.12 thousands of feet. Multiply by the rate: 21.12 × 8 oz = 168.96 oz.

So you’d need about 169 ounces of product (roughly 10.6 pounds) for four miles of row.

For comparison, treating just one mile would require 5,280 ft / 1,000 × 8 oz = 5.28 × 8 = 42.24 oz, about 42 ounces. The numbers in the options reflect the per-mile amount, not the four-mile total.