The two inner terms of a ratio are reciprocals of each other, if one outer term is (2/3), what is the other outer term.
一个比例的两个内项互为倒数，如果一个外项是(2/3)，另一个外项是多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>