In a ratio, the two outer terms are reciprocals of each other, and one of the inner terms is (4/5), then what is the other inner term.
在一个比例中，两个外项互为倒数，其中一个内项是(4/5)，则另一个内项是多少．
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>