I started reading on Children's Day, and I read 90 pages in the first 5 days. Based on this calculation, how many pages can I read in total this month?
从儿童节那天开始看书，前5天看了90页，照这样计算，这个月明明一共可以看多少页？
<gadget id="calculator">90 * 30</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 / 5</gadget>
<output>540</output>

<result>540</result>