Xiao Ming reads a book. He reads 20% of the book on the first day and 42 pages on the second day. The ratio of the number of pages he read to the number of remaining pages is 5:6. How many books did Xiao Ming read in total? Page?
小明读一本书，第一天读了全书的20%，第二天读了42页，这时读的页数与剩下页数的比是5：6，小明读的这本书共有多少页？
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(5/11) - (1/5)</gadget>
<output>14/55 = around 0.254545</output>

<gadget id="calculator">42 / (14/55)</gadget>
<output>165</output>

<result>165</result>