There are 49 pages in a book, and 7 pages are read every day. I have watched it for 2 days, how many more days do I need to watch it?
一本书一共有49页，每天看7页．我已经看了2天，还要看几天？
<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<gadget id="calculator">49 - 14</gadget>
<output>35</output>

<gadget id="calculator">35 / 7</gadget>
<output>5</output>

<result>5</result>