Xiao Ming reads a book. He reads 60 pages on the first day, 15% of the whole book on the second day, 25% of the whole book on the third day, and finishes it in three days. How many pages does this storybook have?
小明看一本书，第一天看了60页，第二天看了全书的15%，第三天看了全书的25%，三天看完，这本故事书一共有多少页？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/20) - (1/4)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">60 / (3/5)</gadget>
<output>100</output>

<result>100</result>