A book has 89 pages, I have read it for a week, and I read 8 pages a day, how many pages are left?
一本书89页，已经看了一周，每天看8页，还剩多少页没看？
<gadget id="calculator">7 * 8</gadget>
<output>56</output>

<gadget id="calculator">89 - 56</gadget>
<output>33</output>

<result>33</result>