Adding 11 to the denominator of a fraction yields (7/13), and adding 6 to the denominator yields (2/3). What is the original score?
一个分数的分母加上11，结果是(7/13)，如果分母加上6，结果是(2/3)．求原来的分数是多少？
<gadget id="calculator">14 / 15</gadget>
<output>14/15 = around 0.933333</output>

<result>14/15 = around 0.933333</result>