For a minimal fraction, its numerator is doubled, the denominator is reduced to (1/4) and then reduced to (1/15), what is the simplest fraction?
一个最简分数，把它的分子扩大2倍，分母缩小到原来的(1/4)后化简成(1/15)，这个最简分数是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<gadget id="calculator">(1/2) / 60</gadget>
<output>1/120 = around 0.008333</output>

<result>1/120 = around 0.008333</result>