Zhang Ming reads a book. He read 36 pages in the first two days, and (1/3) of the whole book in the next two days. He has not read half of the book. How many pages does this book have?
张明看一本书，前两天看了36页，后两天看了全书的(1/3)，还剩一半未看，这本书共有多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

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

<gadget id="calculator">36 / (1/6)</gadget>
<output>216</output>

<result>216</result>