Xiaohong reads a book. She reads (1/3) of the whole book on the first day and (2/5) of the whole book on the second day. There are still 36 pages left to read. How many pages does this book have?
小红看一本书，第一天看了全书的(1/3)，第二天看了全书的(2/5)，这时还剩下36页没有看．这本书一共有多少页？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (1/3) - (2/5)</gadget>
<output>4/15 = around 0.266667</output>

<gadget id="calculator">36 / (4/15)</gadget>
<output>135</output>

<result>135</result>