The gear ratio of a set of meshed gears is 4. If the number of teeth on the driven gear is 100, what is the number of teeth on the driver?

25

Explanation

The gear ratio of a set of meshed
Gears = number of teeth on driven gear / number of teeth on driver
So the number of teeth on the driver = number of teeth on driven gear / gear ratio = 100/4 = 25.

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