A story book has 320 pages. Hong Hong read 132 pages last week, and 68 pages this week. How many pages are left?
一本故事书有320页，红红上周看了132页，这周看了68页，还有多少页没有看．
<gadget id="calculator">132 + 68</gadget>
<output>200</output>

<gadget id="calculator">320 - 200</gadget>
<output>120</output>

<result>120</result>