Xiao Ming reads a book, read it in the morning (1/10), and read 6 pages more in the afternoon than in the morning. At this time, the ratio of the number of pages read to the number of unread pages is 1:3. How many pages does this book have in total? ?
小明读一本书，上午读了(1/10)，下午比上午多读6页，这时已读的页数与未读的页数之比是1：3，这本书一共有多少页？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/10) * 2</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">6 / (1/20)</gadget>
<output>120</output>

<result>120</result>