In a ratio, the two outer terms are exactly reciprocals of each other. If one inner term is known to be (2/11), what is the other inner term?
在一个比例里，两个外项恰好互为倒数，已知一个内项是(2/11)，则另一个内项是多少．
<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">1 / (2/11)</gadget>
<output>11/2 = around 5.5</output>

<result>11/2 = around 5.5</result>