The school cafeteria bought 1 ton of oranges, and all the teachers and students in the school ate 400 kilograms at noon. How many kilograms are left?
学校食堂买来1吨桔子，中午全校师生吃了400千克，还剩多少千克？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 - 400</gadget>
<output>600</output>

<result>600</result>