If 3 is added to the numerator of a simplest fraction, the fraction is equal to (2/3). If its numerator is subtracted from 3, the fraction is equal to (5/12). What is the original simplest fraction?
一个最简分数的分子加上3，这个分数就等于(2/3)，如果它的分子减去3，这个分数等于(5/12)，原来的最简分数是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">(2/3) + (5/12)</gadget>
<output>13/12 = around 1.083333</output>

<gadget id="calculator">(13/12) / 2</gadget>
<output>13/24 = around 0.541667</output>

<result>13/24 = around 0.541667</result>