Xiaoqiang read 35 pages of an extra-curricular book, which happens to be the remaining pages (5/7). How many pages does this book have?
一本课外书，小强看了35页，正好是剩下页数的(5/7)，这本书一共有多少页？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<gadget id="calculator">49 + 35</gadget>
<output>84</output>

<result>84</result>