The difference between any two consecutive interior angles of a polygon is `5o`. If the smallest angle is `120o`, find the number of the sides of the polygon.

Explanation

To solve the problem step by step, we will follow the reasoning laid out in the video transcript and clarify each step.

### Step 1: Define the Variables
Let \( N \) be the number of sides of the polygon. The smallest angle is given as \( 120^\circ \), and the difference between any two consecutive interior angles is \( 5^\circ \).

### Step 2: Express the Angles
The angles of the polygon can be expressed as:
- First angle: \( 120^\circ \)
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