The number of A is 1(1/5) times of the number of B, then the number of B is the number of A.
甲数是乙数的1(1/5)倍，那么乙数是甲数的多少．
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / (6/5)</gadget>
<output>5/6 = around 0.833333</output>

<result>5/6 = around 0.833333</result>