Obviously reading a 268-page story book, I have been reading it for 3 days, and I read 75 pages every day, how many pages are left?
明明看一本268页的故事书，已经看了3天，每天看75页，还剩多少页没看？
<gadget id="calculator">75 * 3</gadget>
<output>225</output>

<gadget id="calculator">268 - 225</gadget>
<output>43</output>

<result>43</result>