Xiaolei read a story book, read the whole book (1/3) on the first day, read 18 pages on the second day, and read exactly half of the book in two days. How many pages does this storybook have?
小磊看一本故事书，第一天看了全书的(1/3)，第二天看了18页，两天正好看了全书的一半．这本故事书有多少页？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(1/2) - (1/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">18 / (1/6)</gadget>
<output>108</output>

<result>108</result>