You work in a hardware store. You have two boxes of nails. The first box weighs 6 pounds, 7 ounces, and the second box weighs 2 pounds, 9 ounces. Which equation can be used to calculate how much the two boxes weigh in ounces?

There are 16 ounces in each pound. The boxes contain 6 + 2 = 8 pounds, which is 16 × 8 = 128 ounces, and their ounces also add to 7 + 9 = 16. So the equation is 16(6 + 2) + 16, which is choice A.

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