Obviously reading a 450-page story book, I have read it for 6 days, and read 55 pages every day. How many pages are there yet?
明明看一本450页的故事书，已经看了6天，每天看55页．还有多少页没有看？
<gadget id="calculator">55 * 6</gadget>
<output>330</output>

<gadget id="calculator">450 - 330</gadget>
<output>120</output>

<result>120</result>