The numerator of a fraction is reduced by 3 times, and the denominator is enlarged by 5 times (3/10). What is the original fraction?
一个分数的分子缩小3倍，分母扩大5倍后是(3/10)，这个分数原来是多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">9 / 2</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>