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  Choose the correct choice from the following:
A) 250	B) 276	C) 280	D) 285	E) None
Solution   since the month begins with a sunday , so there will be five sundays in the month.   Required Average	= (510x5+240x25 / 30)   = (8550 / 30)= 
<gadget id="calculator">(8550 / 30)</gadget>
<output>285</output>
285   Answer 285
<result>D</result>
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