The denominator of a fraction is 49, and the fraction is (3/7). What is the original fraction?
一个分数的分母是49，约分后是(3/7)，原来这个分数是多少．
<gadget id="calculator">7 / 49</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">3 * (1/7)</gadget>
<output>3/7 = around 0.428571</output>

<result>3/7 = around 0.428571</result>