The two internal terms of a ratio are reciprocals of each other, one of the external terms is 3.2, and the other external term is how much.
一个比例的两个内项互为倒数，其中一个外项是3.2，另一个外项是多少．
<gadget id="calculator">1 / 3.2</gadget>
<output>0.3125</output>

<result>0.3125</result>