When Li Lei reads a book, he reads 30 pages on the first day and 54 pages on the second day, leaving 58% of the book. How many pages does this book have?
李磊看一本书，第一天看了30页，第二天看了54页，还剩下全书的58%，这本书一共有多少页？
<gadget id="calculator">30 + 54</gadget>
<output>84</output>

<gadget id="calculator">58 / 100</gadget>
<output>29/50 = around 0.58</output>

<gadget id="calculator">1 - (29/50)</gadget>
<output>21/50 = around 0.42</output>

<gadget id="calculator">84 / (21/50)</gadget>
<output>200</output>

<result>200</result>