Xiao Ming reads a book. He reads (1/5) of the pages of the book on the first day, and reads 40 pages on the second day. The ratio of pages read on the first day to the second day is 3:4. how many pages
小明看一本书，第一天看了全书页数的(1/5)，第二天看了40页，第一天与第二天看的页数比是3：4，这本书共多少页？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">30 / (1/5)</gadget>
<output>150</output>

<result>150</result>