In a ratio, the product of two outer terms is 2, one inner term is 0.2, and what is the other inner term.
在一个比例里，两外项的积是2，一个内项是0.2，另一个内项是多少．
<gadget id="calculator">2 / 0.2</gadget>
<output>10</output>

<result>10</result>