a library has an average of 510 visitors on sunday and 240 on other days. the average number of visitors per day in a month of 30 days beginning with a sunday is	Pick one.
A) 250	B) 276	C) 280	D) 285	E) none
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 510</gadget>
<output>2_550</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 240</gadget>
<output>6_000</output>

<gadget id="calculator">2_550 + 6_000</gadget>
<output>8_550</output>

<gadget id="calculator">8_550 / 30</gadget>
<output>285</output>

<result>D</result>
a library has an average of 510 visitors on sunday and 240 on other days. the average number of visitors per day in a month of 30 days beginning with a sunday is
divide(add(multiply(add(const_4, const_1), 510), multiply(multiply(add(const_4, const_1), add(const_4, const_1)), 240)), 30)
sol . since the month begins with a sunday , so there will be five sundays in the month . ∴ required average = [ 510 x 5 + 240 x 25 / 30 ] = 8550 / 30 = 285 answer d