Study the following table and answer the question that follows.
| City | Population | Men : Women |
| Chandigarh | 1090 | 1 : 1 |
| Kalka | 900 | 3 : 1 |
| Ludhiana | 1510 | 3 : 2 |
| Ambala | 2015 | 2 : 3 |
| Jalandhar | 1500 | 4 : 3 |
What is the difference between the number of men in Chandigarh and Ambala?