A library has an average of 510 visitors on Sundays and 240 on other days. What is the average number of visitors per day in the month of June beginning with a Sunday?

Answer: Option C

If a month beings with Sunday then there are 5 Sundays in that month.
Total number of visitors comes on Sunday
= 510 × 5 = 2550
Total number of visitors come on other days
= 240 × 25 = 6000
∴ Average number of visitor per day
$$\begin{array}{rl}& =\frac{2550+6000}{30}\\ & =\frac{8550}{30}\\ & =285\end{array}$$