The table given below shows the number of officers working in six companies.
| Companies | Officers |
| P | 150 |
| Q | 250 |
| R | 350 |
| S | 100 |
| T | 200 |
| U | 550 |
What is the ratio of number of officers working in Q to the number of officers working in R?
1
7 : 5
2
6 : 7
3
7 : 4
4
5 : 7