There are 800kg of white sugar in the store, after selling 35%, how many kilograms are left.
商店里有800kg白糖，卖出35%后，还剩多少kg．
<gadget id="calculator">35 / 100</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">1 - (7/20)</gadget>
<output>13/20 = around 0.65</output>

<gadget id="calculator">800 * (13/20)</gadget>
<output>520</output>

<result>520</result>