Starting from Children's Day, Liangliang read 210 pages in the first 7 days. Based on this calculation, how many pages did Liangliang read in total? (Answer with proportional knowledge)
从"六一"儿童节那天开始，亮亮前7天看了210页，照这样计算，这个月亮亮一共看了多少页？(用比例知识解答)
<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<result>900</result>