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The wheel of a car has a diameter of 16 inches and moves a smaller wheel of 4 inches. What is the mechanical advantage gained by the system?

A 4:1
Explaination
This systems achieves a mechanical advantage of 4:1. This is a reflection of the difference in the diameters of the wheels. The two diameters (16 inches and 4 inches) have a ratio of 16:4, which is equal to 4:1.
B 1:4
C 1:2
D 2:1