In a ratio, the two internal terms are reciprocals of each other, one of the external terms is (6/5), and the other external term is how much.
在一个比例中，两个内项互为倒数，其中一个外项是(6/5)，另一个外项是多少．
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / (6/5)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>