In a ratio, the two internal terms are exactly the reciprocals of each other. If one external term is known to be (7/8), then what is the other external term.
在一个比例中，两个内项正好互为倒数，已知一个外项是(7/8)，则另一个外项是多少．
<gadget id="calculator">7 / 8</gadget>
<output>7/8 = around 0.875</output>

<gadget id="calculator">1 / (7/8)</gadget>
<output>8/7 = around 1.142857</output>

<result>8/7 = around 1.142857</result>