A science book has 256 pages. Xiaohong has been reading it for 8 days, 20 pages a day. How many pages are left?
一本科技书有256页，小红已读了8天，每天读20页，还剩多少页没读？
<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">256 - 160</gadget>
<output>96</output>

<result>96</result>