A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors per day in a month of 30 days beginning with a Sunday
Since the month begins with a Sunday, so there will be five Sundays in the month.
`:.` Required average + `((510 xx 5 + 240 xx 25)/(30))`= `8550/30` = 285.
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