Question

Ahmedabad is one of the crowedest cities.(change the degree)

Answer 1

Actually, the question that you asked is framed incorrectly.

It should be, "Ahmedabad is one of the most  crowded cities."

This is the superlative degree.

The Positive degree form will be, "Very few cities are as crowded as Ahmedabad."

The Comparative degree form will be, " Ahmedabad is more crowded than most other cities."