The cafeteria shipped 850 kilograms of rice and ate it for 6 days, with an average of 28 kilograms per day. How many kilograms are left?
食堂运来850千克大米，吃了6天，平均每天吃了28千克，还剩多少千克？
<gadget id="calculator">28 * 6</gadget>
<output>168</output>

<gadget id="calculator">850 - 168</gadget>
<output>682</output>

<result>682</result>