Pour 4 bowls of water into a large bottle, and the total weight of the bottle is 2000 grams. Pour 6 bowls of water, and the total weight of the bottle is 2400 grams. How many grams does the bottle weigh?
一个大瓶子倒进4碗水，连瓶共重2000克，倒进6碗水，连瓶共重2400克，瓶子重多少克？
<gadget id="calculator">2_400 - 2_000</gadget>
<output>400</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">4 * 200</gadget>
<output>800</output>

<gadget id="calculator">2_000 - 800</gadget>
<output>1_200</output>

<result>1_200</result>