Xiaohua reads a book. He reads (1/6) on the first day and 15 pages on the second day. How many pages does the book have?
小华看一本书，第一天看了(1/6)，第二天看了15页，这时已看的页数相当于未看的页数的(3/5)，这本故事书共有多少页？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(3/5) / (8/5)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (1/6) - (5/8)</gadget>
<output>5/24 = around 0.208333</output>

<gadget id="calculator">15 / (5/24)</gadget>
<output>72</output>

<result>72</result>