A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:
250
276
280
285
Explanation:
Since the month begins with a Sunday, to there will be five Sundays in the month.
| Required average | =$ \left(\dfrac{510 \times 5 + 240 \times 25}{30} \right) $ |
| =$ \dfrac{8550}{30} $ | |
| = 285 |