For a fraction in its simplest form, the difference between the numerator and the denominator is 12. If 1 is subtracted from the numerator and 3 is added to the denominator, the resulting new fraction is (3/5), what is the original fraction?
一个最简分数，分子与分母之差为12．若分子减去1，分母加上3，所得新分数约分后是(3/5)，则原分数是多少．
<gadget id="calculator">25 + 12</gadget>
<output>37</output>

<gadget id="calculator">25 / 37</gadget>
<output>25/37 = around 0.675676</output>

<result>25/37 = around 0.675676</result>