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?
- 280
- 290
- 285
- 300
Explanation
If a month starts with Sunday, then the number of Sundays in that month is The remaining days is
Given that average number of visitors on Sundays is
Therefore,
-----(1)
Given that average number of visitors on other days is
Therefore,
-----(2)
Total average is
Therefore, the average number of visitors per day in a month of 30 days beginning with a Sunday is
Given that average number of visitors on Sundays is
Therefore,
-----(1)
Given that average number of visitors on other days is
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