Answer:
12 teeth
Explanation:
The attachment of this question is missing; however, the question can be solved without the attachment
Given:
Larger Gear = 6
Smaller Gear = 1
Required
Number of Smaller Gear if there are 72 larger gears
When the number of larger gear is 6, smaller gears is 1;
This can be represented using the following ratio;

Let x represent the number of smaller gear, when there are 72 larger gears;
This can also be represented using the following ratio;

Equate both ratios

Convert the ratios to fraction

Multiply both sides by x


Divide both sides by 6.



This implies that there are 12 teeth on the smaller gear