A box contains different colored pens. The number of pens of each color is shown in the table.
Pens in a Box
| Color | Number |
|---|---|
| Black | 15 |
| Red | 10 |
| Blue | 20 |
| Green | 5 |
| Total | 50 |
If a pen is chosen at random from the box, what is the probability that the pen is NOT red?
