For a fraction, the sum of the numerator and the denominator is 37. If 3 is subtracted from the denominator, the fraction is equal to 1. What is the original fraction?
一个分数，分子与分母的和是37，如果分母减去3，这个分数就等于1，原来的分数是多少？
<gadget id="calculator">37 + 3</gadget>
<output>40</output>

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

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">37 - 20</gadget>
<output>17</output>

<gadget id="calculator">17 / 20</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>