A ratio, the two outer terms are reciprocals of each other, one of the inner terms is 0.875, and what is the other inner term.
一个比例，两外项互为倒数，其中一个内项是0.875，另一个内项是多少．
<gadget id="calculator">1 / 0.875</gadget>
<output>1.142857</output>

<result>1.142857</result>