A library has an average number of 510 visitors on sunday and 240 on other days. The average number of visitors per day in a month of 30 day beginning with sunday is -

Answer: Option A

According to the question
Average number of visitors on sunday = 510
Average number of visitors on other days = 240
∴ If month start on sunday then there are five sundays in a month and 25 other days.
∴ Number of visitors on sundays = 510 × 5 = 2550
Number of visitors on other days = 240 × 25 = 6000
∴ Average visitors = $$\frac{2550+6000}{30}$$   = 285