Xiao Gang reads a story book and has read 65% of the whole book, which is 45 pages more than the remaining pages. How many pages does this book have?
小刚看一本故事书，已经看了全书的65%，比剩下的页数多45页，这本书一共有多少页？
<gadget id="calculator">65 / 100</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">1 - (13/20)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(13/20) - (7/20)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">45 / (3/10)</gadget>
<output>150</output>

<result>150</result>