A bag of rice is 25kg, and (2/5) of it has been eaten, how many kilograms are left.
一袋大米25kg，已经吃了它的(2/5)，还剩多少kg．
<gadget id="calculator">2 / 5</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">25 * (3/5)</gadget>
<output>15</output>

<result>15</result>