Xiaohong reads a book, and has already read 24 pages, accounting for 30% of the whole book, how many pages are left.
小红看一本书，已经看了24页，占全书的30%，还剩多少页没看．
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">24 / (3/10)</gadget>
<output>80</output>

<gadget id="calculator">80 - 24</gadget>
<output>56</output>

<result>56</result>