In a ratio, the two inner terms are 12 and 4, one of the outer terms is 8, and the other outer term is what.
在一个比例中，两个内项分别是12和4，其中一个外项是8，另一个外项是多少．
<gadget id="calculator">4 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<result>6</result>