If I read 20% of the whole book in the first week and 35% of the whole book in the second week, I read a total of 110 pages in two weeks. How many pages does this book have?
一本书第一周看了全书的20%，第二周看了全书的35%，两周一共看了110页，这本书一共有多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">(1/5) + (7/20)</gadget>
<output>11/20 = around 0.55</output>

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

<result>200</result>