Xiao Ming reads a story book. He reads (1/4) of the whole book on the first day and (1/5) of the whole book on the second day. There are 110 pages left. How many pages are there in this book?
小明看一本故事书，第一天看了全书的(1/4)，第二天看了全书的(1/5)，还剩110页没看，这本书有多少页？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) + (1/5)</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (9/20)</gadget>
<output>11/20 = around 0.55</output>

<gadget id="calculator">110 / (11/20)</gadget>
<output>200</output>

<result>200</result>