In a ratio, the two internal terms are reciprocals of each other, one of the external terms is (2/3), and the other external term is
在一个比例中，两个内项互为倒数，其中一个外项是(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>