You are using tackle number 5 as shown in illustration D029DG below to lift a weight. The hauling part of this tackle is bent to the weight hook (w) of tackle number 8. What is the mechanical advantage of this rig?

Correct Answer: Option B — 15

Mechanical advantage is calculated by multiplying the mechanical advantage of the individual tackles in a compound system. Tackle 5 provides a 3:1 advantage, and tackle 8 provides a 5:1 advantage. Multiplying 3 by 5 results in a total mechanical advantage of 15 for the combined rig.