For a fraction, the sum of the numerator and the denominator is 37. If 1 is subtracted from the numerator, the value of the fraction becomes 1/2. What is the original fraction?
一个分数，分子和分母之和是37，若分子减去1，这个分数的值就变成1/2，原来的分数是多少．
<gadget id="calculator">2 + 37</gadget>
<output>39</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">39 / 3</gadget>
<output>13</output>

<gadget id="calculator">37 - 13</gadget>
<output>24</output>

<gadget id="calculator">39 / 3 / 24</gadget>
<output>13/24 = around 0.541667</output>

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