A pile of coal has used 700 kilograms, and there are 400 kilograms left. How many kilograms are there in this pile of coal?
一堆煤，用了700千克，还剩400千克，这堆煤有多少千克？
<gadget id="calculator">700 + 400</gadget>
<output>1_100</output>

<result>1_100</result>