Lele read a storybook in July, and read 15 pages a day. After reading it for a month, there are still 35 pages left. How many pages are there in this book?
乐乐7月份看一本故事书，每天看15页，看了一个月后，还剩下35页，这本书一共多少页？
<gadget id="calculator">15 * 31</gadget>
<output>465</output>

<gadget id="calculator">465 + 35</gadget>
<output>500</output>

<result>500</result>