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

Correct Answer: Option C — 20

When two tackles are compounded, the total mechanical advantage is the product of the individual mechanical advantages. Tackle 4 has an MA of 4, and Tackle 10 has an MA of 5. Multiplying these (4 x 5) results in a total mechanical advantage of 20 for the combined rig.