A batch of rice was shipped from the school cafeteria, 280 kilograms have been eaten, and there are 650 kilograms left. How many kilograms of rice are shipped from the cafeteria? (Resolution of equations containing unknown x)
学校食堂运来一批大米，已经吃去了280千克，还剩650千克，食堂运来大米多少千克？(列含有未知数x的等式再解答)
<gadget id="calculator">650 + 280</gadget>
<output>930</output>

<result>930</result>