If the product of two outer terms in a ratio is 4 and one inner term is 0.5, what is the other inner term.
如果一个比例里两个外项的积是4，其中一个内项是0.5，那么另一个内项是多少．
<gadget id="calculator">4 / 0.5</gadget>
<output>8</output>

<result>8</result>