Xiao Ming reads a story book, read 16 pages on the first day, and 15% of the whole book on the second day, leaving 69 pages unread. How many pages does this book have?
小明看一本故事书，第一天看了16页，第二天看了全书的15%，还剩69页没看．这本书共有多少页？
<gadget id="calculator">16 + 69</gadget>
<output>85</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">85 / (17/20)</gadget>
<output>100</output>

<result>100</result>