Xiaohong reads an extra-curricular reading, and has read 35 pages, which is exactly 20% of the extra-curricular reading. How many pages does this book have?
小红看一本课外读物，已经看了35页，正好是这本课外读物的20%．这本书有多少页？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">35 / (1/5)</gadget>
<output>175</output>

<result>175</result>