In a ratio, the two outer terms are exactly reciprocals of each other. It is known that one of the inner terms is (15/7) and the other inner term is.
在一个比例中，两个外项正好互为倒数，已知其中一个内项是(15/7)，另一个内项是多少．
<gadget id="calculator">15 / 7</gadget>
<output>15/7 = around 2.142857</output>

<gadget id="calculator">1 / (15/7)</gadget>
<output>7/15 = around 0.466667</output>

<result>7/15 = around 0.466667</result>