A library has an average of 510 visitors on Sundays and 240 on other day. The average number of visitors in a month of 30 days starting with Sunday is:
Answer: B
As the month begin with Sunday, so there will be five Sundays in the month. So result will be:
\(= \left (\dfrac{510 \times 5 + 240 \times 25}{30}\right)\\
= \left( \dfrac{8550}{30} \right)\\
= 285\)