For a fraction, if the denominator is subtracted by 2, it will be (3/4) after the denominator, and if the denominator is added by 9, it will be (5/7) after the denominator. So, what is the original score.
一个分数，如果分母减2，约分后是(3/4)，如果分母加9，约分后是(5/7)．那么，原来的分数是多少．
<gadget id="calculator">220 + 2</gadget>
<output>222</output>

<gadget id="calculator">165 / 222</gadget>
<output>55/74 = around 0.743243</output>

<result>55/74 = around 0.743243</result>