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?

Answer: 285
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 

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