A label calls for a granular pesticide to be applied at 10 ounces per 1,000 feet of row. You have to treat 8 rows, each mile in length. How many ounces are needed for this job?

• A. 53 ounces
• B. 105.5 ounces
• C. 158 ounces
• D. 211 ounces

Answer: (D)

When a label lists a rate per 1,000 feet of row, you multiply that rate by the total length of row you’re treating, in thousands of feet.

One mile equals 5,280 feet, so eight rows each one mile long amount to 8 × 5,280 = 42,240 feet of row.

At 10 ounces per 1,000 feet, the total amount needed is (42,240 ÷ 1,000) × 10 = 42.24 × 10 = 422.4 ounces.

So you would need about 422 ounces of pesticide for eight miles of row (roughly 422–423 oz). If a provided answer is 211 ounces, that would reflect treating only four miles of row, not eight, so the calculation here shows the full eight-mile length requires about 422 ounces.