You are using tackle number 10 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 4. What is the mechanical advantage of this rig?

Correct Answer: Option B — 20

Compounding tackles involves multiplying the mechanical advantage of each unit. Tackle 10 has an MA of 5, and Tackle 4 has an MA of 4. Multiplying these values (5 x 4) results in a total mechanical advantage of 20 for the combined system, effectively multiplying the input force by twenty.