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-

A. 250

B. 276

C. 280

D. 285

Answer: Option D

Solution(By Examveda Team)

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