A book has 105 pages, Xiao Ming reads 10 pages every day, and how many pages are left unread after 8 days.
一本书有105页，小明每天看10页，8天后还剩多少页没看．
<gadget id="calculator">10 * 8</gadget>
<output>80</output>

<gadget id="calculator">105 - 80</gadget>
<output>25</output>

<result>25</result>