Xiaohong read 48 pages yesterday and 52 pages today. This book has a total of 300 pages. How many pages are left?
小红昨天看了48页，今天又看了52页，这本书一共300页，还剩多少页没看？
<gadget id="calculator">48 + 52</gadget>
<output>100</output>

<gadget id="calculator">300 - 100</gadget>
<output>200</output>

<result>200</result>