(1/3) of A's number and (3/5) of B's number, how much less is B's number than A's number.
甲数的(1/3)乙数的(3/5)，乙数比甲数少多少．
<gadget id="calculator">6 / 5</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">(6/5) - 1</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) / (6/5)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>