From the day of Children's Day, I read 210 pages of books in 7 days. Based on this calculation, how many pages of books did Mingming read in total this month? (Answer with proportional knowledge)
从儿童节那天起，明明7天看了210页书．照这样计算，这个月明明一共看了多少页书？(用比例知识解答)
<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<gadget id="calculator">210 * 30</gadget>
<output>6_300</output>

<gadget id="calculator">6_300 / 7</gadget>
<output>900</output>

<result>900</result>