A bag of rice is 25 kilograms, if (4/5) kilograms are used up, how many kilograms are left?
一袋大米25千克，用去(4/5)千克，还剩多少千克．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 - (4/5)</gadget>
<output>121/5 = around 24.2</output>

<result>121/5 = around 24.2</result>