The mechanical advantage (amount of change in speed or torque) of connected gears is proportional to the **number of teeth** each gear has. Called gear ratio, it's the ratio of the number of teeth on the larger gear to the number of teeth on the smaller gear. For example, a gear with 12 teeth connected to a gear with 9 teeth would have a gear ratio of 4:3.

If you have a gear train with three gears, the first with 24 teeth, the second with 14 teeth, and the third with 6 teeth, what is its mechanical advantage?

2 | |

4 | |

1.3 | |

7 |