Xiaohua read (1/4) of a book in 3 days. At this rate, how many days will it take to finish reading this book?
小华3天看了一本书的(1/4)，照这样的速度，看完这本书共需要多少天．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 3</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / (1/12)</gadget>
<output>12</output>

<result>12</result>