A coffee shop recorded customer orders by drink type and size. The results for one hour are shown in the table below.
| Small | Medium | Large | |
|---|---|---|---|
| Coffee | 10 | 15 | 20 |
| Tea | 8 | 12 | 5 |
| Smoothie | 5 | 10 | 15 |
If a randomly selected customer ordered a large-sized drink, what is the probability that they ordered coffee?
