The canteen brought in 1,400 kilograms of rice, ate 400 kilograms in the first week, and 500 kilograms in the second week. How many kilograms of rice are left in the canteen? (answer in two ways)
食堂运进大米1400千克，第一周吃了400千克，第二周吃了500千克，食堂还剩大米多少千克？(用两种方法解答)
<gadget id="calculator">1_400 - 400 - 500</gadget>
<output>500</output>

<gadget id="calculator">400 + 500</gadget>
<output>900</output>

<gadget id="calculator">1_400 - 900</gadget>
<output>500</output>

<result>500</result>