Answer:
Ratio will be :
![(3)/(1)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/aitrxxy2j92s43dz4jwvi67gthqgqam7k1.png)
Explanation:
A gear ratio is the ratio of the teeth on the front sprocket and the teeth on the rear sprocket.
When a bike has 36 teeth on the front sprocket and 12 rear teeth, the gear ratio will be :
We can also write this as 3:1