There is a book, if you read 35 pages on the first day, then you will read 5 more pages every day than the previous day, and you will end up reading only 35 pages on the last day. I read 5 more pages than the previous day, but in the last day I only read 40 pages and finished it. Q: How many pages does this book have?
有一本书，如果第一天读35页，以后每天都比前一天多读5页，结果最后一天只读35页，就读完了；还是这本书，如果第一天读45页，以后每天都比前一天多读5页，结果最后一天只读40页也读完了．问：这本书有多少页？
<gadget id="calculator">70 + 40</gadget>
<output>110</output>

<gadget id="calculator">7 / 2</gadget>
<output>7/2 = around 3.5</output>

<gadget id="calculator">110 * (7/2)</gadget>
<output>385</output>

<result>385</result>