In a ratio, the two outer terms are exactly reciprocals of each other. It is known that one inner term is 3 and the other inner term is how much.
在一个比例中，两个外项正好互为倒数．已知一个内项是3，另一个内项是多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>