The canteen shipped a batch of 800 kilograms of rice, used up (1/5) of it on the first day, and used up 20% of it on the second day, how many kilograms are left.
食堂运来一批大米800千克，第一天用去了它的(1/5)，第二天又用去了它的20%，还剩多少千克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">800 * (3/5)</gadget>
<output>480</output>

<result>480</result>