In a book, the ratio of the number of pages Xiaohong has read to the number of pages she has not read is 3:11. If she reads another 48 pages, which is exactly half of the book, how many pages does the book have?
一本书，小红已经看的页数和未看的页数比是3：11，如果再看48页正好看这本书的一半，这本书一共有多少页？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 + 11</gadget>
<output>14</output>

<gadget id="calculator">3 / 14</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">(1/2) - (3/14)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">48 / (2/7)</gadget>
<output>168</output>

<result>168</result>