Here are 5 fractions: (2/3), (5/8), (15/23), (10/17), (12/19). If they are arranged in order of size, what is the number in the middle?
这里有5个分数：(2/3)，(5/8)，(15/23)，(10/17)，(12/19)．如果按大小顺序排列，排在中间的数是多少．
<gadget id="calculator">12 / 19</gadget>
<output>12/19 = around 0.631579</output>

<result>12/19 = around 0.631579</result>