If the numerator of a fraction is enlarged by 3 times and the denominator is reduced by 2.5 times, 4(1/2) is obtained. What is the original fraction?
一个分数分子扩大3倍，分母缩小2.5倍后，得到4(1/2)，原来分数是多少．
<gadget id="calculator">9 / 3</gadget>
<output>3</output>

<gadget id="calculator">2 * 2.5</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

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