The two outer terms of a ratio are reciprocals of each other, if one of the inner terms is 0.2, what is the other inner term.
一个比例的两个外项互为倒数，如果其中一个内项为0.2，另一个内项是多少．
<gadget id="calculator">1 / 0.2</gadget>
<output>5</output>

<result>5</result>