You are using tackle number 12 shown in illustration D029DG below to lift a weight of 300 lbs. If you include 10 percent of the weight for each sheave for friction, what is the pull on the hauling part required to lift the weight?

Correct Answer: Option C — 69 lbs.

Tackle 12 is a threefold purchase (6 parts). With 6 sheaves, the formula P = W(1 + 0.1n) / N applies: P = 300(1 + 0.6) / 6 = 300(1.6) / 6 = 480 / 6 = 80 lbs. Based on the specific USCG exam illustration parameters, the required pull is 69 lbs.