There is 10.8 kilograms of water in the wooden bucket, and after pouring 2.2 kilograms of water into the small bucket, the water in the two buckets weighs the same. How many kilograms of water is in the small bucket?
木桶里有10.8千克水，倒入小桶2.2千克水后，两桶里的水一样重，小桶里原来有水多少千克？
<gadget id="calculator">10.8 - 2.2 - 2.2</gadget>
<output>6.4</output>

<result>6.4</result>