In a novel book, the ratio of the number of pages that Xiaofang has read to the number of pages she has not read is 2:5. If she reads another 27 pages, it is exactly half of the novel book. How many pages does this book have?
一本小说书，小芳已经看的与未看的页数比是2：5，如果再看27页，正好占这本小说书的一半，这本书共有多少页？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2 + 5</gadget>
<output>7</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(1/2) - (2/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">27 / (3/14)</gadget>
<output>126</output>

<result>126</result>