Question

The 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:

• A. $250$
• B. $276$
• C. $280$
• D. $285$

Answer 1

The correct option is D $285$

Since the month begins with a sunday, to there will be five Sundays in the month.
Required average $=\left(\frac{510\times 5+240\times 25}{30}\right)$
$=\frac{8550}{30}$
$=285$