Xiaowen reads a story book, reads 15% of the whole book on the first day, and 25% of the whole book on the second day, leaving 60 pages. How many pages does this storybook have?
小文看一本故事书，第一天看了全书的15%，第二天看了全书的25%，还剩下60页．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>