In a ratio, the product of the two inner terms is 18, one outer term is 5, and the other outer term is 18.
在一个比例里，两个内项的积是18，一个外项是5，另一个外项是多少．
<gadget id="calculator">18 / 5</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>