I read 35 pages this weekend, which happens to be (5/7) of this extracurricular reading. How many pages are there in this extracurricular reading?
这个周末我看了35页，正好是这本课外读物的(5/7)，这本课外读物一共有多少页？
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

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

<result>49</result>