The cafeteria bought 1600 kilograms of rice and ate it for 21 days, with an average of 45 kilograms per day. How many kilograms of rice are left in the cafeteria?
食堂买回1600千克的大米，吃了21天，平均每天吃45千克，食堂还剩多少千克大米？
<gadget id="calculator">21 * 45</gadget>
<output>945</output>

<gadget id="calculator">1_600 - 945</gadget>
<output>655</output>

<result>655</result>