The sum of the numerator and denominator of a fraction is 37. If the numerator and denominator are reduced by 5 at the same time, it becomes (4/5) after simplification. What is the original fraction?
一个分数的分子与分母的和是37，如果分子、分母同时减少5后，化简后变成(4/5)，原来这个分数是多少？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 37</gadget>
<output>148/5 = around 29.6</output>

<gadget id="calculator">(4/5) * 5</gadget>
<output>4</output>

<gadget id="calculator">(148/5) - 4</gadget>
<output>128/5 = around 25.6</output>

<gadget id="calculator">5 + (128/5)</gadget>
<output>153/5 = around 30.6</output>

<gadget id="calculator">1 + (4/5)</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">(153/5) / (9/5)</gadget>
<output>17</output>

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

<gadget id="calculator">(153/5) / (9/5) / 20</gadget>
<output>17/20 = around 0.85</output>

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