After pouring 8 bowls of water into a bucket, the total weight of the bucket and water is 2000 grams; after pouring 10 bowls of water, the total weight of the bucket and water is 2400 grams. How much does the bucket weigh?
一只水桶倒进8碗水后，水桶和水的总重量是2000克；倒进10碗水后，水桶和水的总重量是2400克．水桶有多重？
<gadget id="calculator">2_400 - 2_000</gadget>
<output>400</output>

<gadget id="calculator">10 - 8</gadget>
<output>2</output>

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

<gadget id="calculator">200 * 8</gadget>
<output>1_600</output>

<gadget id="calculator">2_000 - 1_600</gadget>
<output>400</output>

<result>400</result>