A bag of white sugar is 40 kilograms, how many kilograms are left after using (3/5).
一袋白糖40千克，用了(3/5)还剩多少千克．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">40 * (2/5)</gadget>
<output>16</output>

<result>16</result>