In a ratio, the product of the two outer terms is 1. If one inner term is 2, then what is the other inner term.
在一个比例里，两个外项的积是1．如果一个内项是2，那么另外一个内项是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>