A book has 60 pages. Xiaohong has read (1/4) of this book in 3 days. How many more days will she have to read?
一本书60页，小红3天看了这本书的(1/4)，还要再看多少天．
<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>

<gadget id="calculator">12 - 3</gadget>
<output>9</output>

<result>9</result>