(1/4) of a book is 40 pages, how many pages does this book have?
一本书的(1/4)是40页，这本书共有多少页．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 / (1/4)</gadget>
<output>160</output>

<result>160</result>