Xiaohong reads a 290-page novel, and reads 20 pages a day for the first 4 days, and plans to read 10 more pages a day for the rest, how many days will it take to finish the book?
小红看一本290页的小说，前4天每天看20页，其余的计划每天多看10页，再用多少天可以看完这本书？
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">290 - 80</gadget>
<output>210</output>

<gadget id="calculator">20 + 10</gadget>
<output>30</output>

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

<result>7</result>