A book has 130 pages. Xiaoyong reads 16 pages every day. He has read it for 5 days. How many pages are left?
一本书有130页，小勇每天看16页，已经看了5天，还剩多少页没有看？
<gadget id="calculator">16 * 5</gadget>
<output>80</output>

<gadget id="calculator">130 - 80</gadget>
<output>50</output>

<result>50</result>