A is B's (3/5), then how much is B's A's.
甲是乙的(3/5)，那么乙是甲的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>