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:
Options:
A .  250
B .  276
C .  280
D .  285
Answer: Option D
Since the month begins with a Sunday, to there will be five Sundays in the month.
Required average = 510 x 5 + 240 x 25 30 = 8550 30 = 285
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