Xiao Ming reads a book and reads part of it on the first day. The ratio of pages read to unread is 1:8. He reads 68 pages on the second day, and the ratio of pages read to unread is 1:2. ． How many pages does this book have?
小明看一本书，第一天读了一部分，已读的和未读的页数比是1：8，第二天读了68页，已读的和未读的页数比是1：2．这本书共有多少页？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + 8</gadget>
<output>9</output>

<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(1/3) - (1/9)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">68 / (2/9)</gadget>
<output>306</output>

<result>306</result>