Obviously read a 370-page story book, and it took a week to read it. In the first 3 days, I read 50 pages a day. How many pages did I read on average for the remaining pages?
明明看一本370页的故事书，用了一个星期的时间看完，前3天每天看了50页，剩下的页数平均每天看了多少页？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">370 - 150</gadget>
<output>220</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<result>55</result>