The number A is (2/5) of the number B, how much less is the number A than the number B?
甲数是乙数的(2/5)，甲数比乙数少百分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) / 1</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>