Xiaoya reads a 470-page book. She reads 25 pages a day for the first 8 days, and plans to read 30 pages a day for the rest. How many days will it take for Xiaoya to finish this book?
小亚看一本470页的书，前8天每天看25页，剩下的计划每天看30页，小亚看完这本书还要多少天？
<gadget id="calculator">25 * 8</gadget>
<output>200</output>

<gadget id="calculator">470 - 200</gadget>
<output>270</output>

<gadget id="calculator">270 / 30</gadget>
<output>9</output>

<result>9</result>