When there are 12 web visits, there are 4 downloads When there are 12 web visits, there are 4 downloads When there are 12 downloads, there are 4 web visits When there are 12 downloads, there are 4 web visits As the number of web visits increase by 12, the number of downloads decreases by 4 As the number of web visits increase by 12, the number of downloads decreases by 4 [As the number of web visits decrease by 12, the number of downloads increase by 4

Given the information provided, we can deduce the following relationships:

1. Ratio of web visits to downloads:
- 12 web visits : 4 downloads
- Simplified ratio: 3 web visits : 1 download

2. Ratio of downloads to web visits:
- 12 downloads : 4 web visits
- Simplified ratio: 3 downloads : 1 web visit

3. Relationship between increase/decrease in web visits and downloads:
- For every increase of 12 web visits, there is a decrease of 4 downloads
- This can be represented as an inverse relationship: as web visits increase, downloads decrease

Therefore, if the number of web visits decrease by 12, the number of downloads would increase by 4. This is based on the established ratios and relationship between web visits and downloads.