When Xiao Ming reads a book, he reads (1/6) on the first day, and reads (5/7) on the second day, leaving 290 pages. How many pages are there in this book?
小明看一本书，第一天看了(1/6)，第二天看的相当于第一天的(5/7)，还剩290页．这本书一共多少页？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(1/6) * (5/7)</gadget>
<output>5/42 = around 0.119048</output>

<gadget id="calculator">1 - (1/6) - (5/42)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">290 / (5/7)</gadget>
<output>406</output>

<result>406</result>