75% of a number is 39, what is its (1/4)?
一个数的75%是39，它的(1/4)是多少．
<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">39 / (3/4)</gadget>
<output>52</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">52 * (1/4)</gadget>
<output>13</output>

<result>13</result>