The denominator of a fraction is doubled, and the numerator is quadrupled to (10/12). What is the original fraction?
一个分数的分母扩大2倍，分子扩大4倍后是(10/12)，原来的分数是多少．
<gadget id="calculator">10 / 12</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(5/6) * (1/2)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>