For a fraction, divide the numerator by 2 and multiply the denominator by 2 to get (3/20), then what is the original fraction?
一个分数，分子除以2，分母乘2后得(3/20)，那么原分数是多少．
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 4</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>