A bag of flour is 25 kilograms, if (1/5) of it is eaten, how many kilograms are left?
一袋面粉25千克，吃掉它的(1/5)，还剩多少千克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

<result>20</result>