In a ratio, the two outer terms are 20 and 8, one inner term is 16, and the other inner term is what.
在一个比例中，两个外项分别是20和8，其中一个内项是16，另一个内项是多少．
<gadget id="calculator">8 / 16</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">20 * (1/2)</gadget>
<output>10</output>

<result>10</result>