If a gear with 20 teeth is driving a gear with 60 teeth, the gear ratio is ________.

To determine the gear ratio in a system where one gear drives another, you can use the number of teeth on each gear to find the ratio. The gear ratio is calculated by dividing the number of teeth on the driven gear (the one being turned) by the number of teeth on the driving gear (the one providing the motion).

In this scenario, you have a driving gear with 20 teeth and a driven gear with 60 teeth. By performing the calculation, you would divide 60 by 20. This results in a ratio of 3:1. This means that for every turn of the driving gear (the one with 20 teeth), the driven gear (the one with 60 teeth) completes one-third of a turn.

This illustrates a mechanical advantage, emphasizing that a smaller gear drives a larger gear, resulting in an increase in torque while decreasing the speed. In this case, 3:1 correctly describes the relationship between the two gears based on their teeth counts.