When Xiao Ming reads a book, the ratio of the number of pages he has read to the number of unread pages is 1:5 one day later, and he reads 6 more pages on the second day than the first day. At this time, the ratio of the number of pages he has read to the number of unread pages is 3:5. How many pages does this book have.
小明读一本书，一天后已读页数和未读页数的比是1：5，第二天比第一天多读6页，这时已读页数与未读页数的比是3：5．这本书有多少页．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 + 5</gadget>
<output>6</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) * 2</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/8) - (1/3)</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">6 / (1/24)</gadget>
<output>144</output>

<result>144</result>