Zhang Qiang read an English book, the first time he read the whole book (1/6), the second time he read 40 pages more than the first time, and it is known that he read a total of 310 pages in the first two times. How many books are there in this English book?
张强看一本英文书，第一次看了全书的(1/6)，第二次比第一次多看40页，已知前两次共看了310页．这本英文书一共有多少本书？
<gadget id="calculator">310 - 40</gadget>
<output>270</output>

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

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

<gadget id="calculator">270 / (1/3)</gadget>
<output>810</output>

<result>810</result>