A factory has two machines, Machine A and Machine B, that produce widgets. The table below shows the number of widgets produced by each machine over four days.
| Day | Machine A | Machine B |
|---|---|---|
| 1 | 250 | 280 |
| 2 | 265 | 270 |
| 3 | 240 | 290 |
| 4 | 275 | 260 |
What is the average (arithmetic mean) number of widgets produced per day by both machines combined over these four days?
260
265
267.5
270
