Yang Yang reads a 330-page novel. I have read it for 6 days, with an average of 20 pages per day. After reading the remaining 7 days, how many pages do you read on average per day?
杨阳看一本330页的小说书．已经看了6天，平均每天看20页．剩下的7天看完，平均每天要看多少页？
<gadget id="calculator">20 * 6</gadget>
<output>120</output>

<gadget id="calculator">330 - 120</gadget>
<output>210</output>

<gadget id="calculator">210 / 7</gadget>
<output>30</output>

<result>30</result>