The table below shows the number of units produced (in thousands) by three different factories from Monday to Friday.
What is the ratio of the total units produced by Factory A to the total units produced by Factory C during the entire week?
| Day | Factory A | Factory B | Factory C |
|-----------|-----------|-----------|-----------|
| Monday | 150 | 180 | 120 |
| Tuesday | 160 | 170 | 130 |
| Wednesday | 140 | 165 | 140 |
| Thursday | 170 | 185 | 150 |
| Friday | 180 | 190 | 160 |