For a fraction, the sum of the numerator and the denominator is 75. If 3 is added to the numerator, it can be reduced to (5/8). What is the original fraction?
一个分数，分子与分母的和是75，若分子加上3，则可约简成(5/8)，原来的分数是多少．
<gadget id="calculator">75 + 3</gadget>
<output>78</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">5 / 13</gadget>
<output>5/13 = around 0.384615</output>

<gadget id="calculator">78 * (5/13)</gadget>
<output>30</output>

<gadget id="calculator">30 - 3</gadget>
<output>27</output>

<gadget id="calculator">78 - 30</gadget>
<output>48</output>

<gadget id="calculator">27 / 48</gadget>
<output>9/16 = around 0.5625</output>

<result>9/16 = around 0.5625</result>