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Question:

The smaller gear has 8 teeth, and the larger gear has 16 teeth. When the larger gear makes 12 revolutions, how many revolutions will the smaller gear make?

A 24
Explaination

The gear ratio here is 2:1, meaning that for every revolution of the larger gear, the smaller gear revolves twice. If the larger gear revolves 12 times, the smaller gear will revolve twice as many times.