The younger brother reads a storybook, and he has already read 72 pages, and the number of pages he has not read is three times that of the pages he has read. How many pages are there in total? How many more pages have you not read than you have read?
弟弟看一本故事书，已经看了72页，没看的页数是已看的3倍，这本书一共有多少页？没看的页数比已看的页数多几页？
<gadget id="calculator">72 * 3</gadget>
<output>216</output>

<gadget id="calculator">216 - 72</gadget>
<output>144</output>

<result>144</result>