The following table shows the number of watches of 5 brands sold by two showrooms.
| Showroom 1 | Showroom 2 | |
| Brand 1 | 60 | 35 |
| Brand 2 | 55 | 75 |
| Brand 3 | 75 | 50 |
| Brand 4 | 48 | 62 |
| Brand 5 | 52 | 38 |
M = per brand average number of watches sold from Showroom 1
What is the ratio of the number of watches of Brand 3 sold from Showroom 2 to M?
1
27 : 31
2
28 : 37
3
25 : 29
4
26 : 33