Smiling and reading a 240-page book for 4 days, with an average of 35 pages per day, how many more pages can I finish reading?
笑笑看一本240页的书，看了4天，平均每天看35页，再看多少页可以看完？
<gadget id="calculator">35 * 4</gadget>
<output>140</output>

<gadget id="calculator">240 - 140</gadget>
<output>100</output>

<result>100</result>