The school cafeteria has 2,750 kilograms of rice. After eating some, I bought another 250 kilograms. At this time, there are 1,000 kilograms of rice left. How many kilograms of rice did you eat?
学校食堂有大米2750千克，吃了一些后，又买来250千克，这时大米还剩1000千克，吃了多少千克大米？
<gadget id="calculator">1_000 - 250</gadget>
<output>750</output>

<gadget id="calculator">2_750 - 750</gadget>
<output>2_000</output>

<result>2_000</result>