Lan Lan read 35 pages of a book, and left (2/7) unread. How many pages are there in this book?
一本书兰兰读了35页，还剩下(2/7)没读．这本书一共多少页？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">35 / (5/7)</gadget>
<output>49</output>

<result>49</result>