There are 10.8 kilograms of water in the big bucket, and after pouring 2.8 kilograms of water into the small bucket, the water in the big bucket is the same as the water in the small bucket. How many kilograms of water are there in the small bucket?
大桶里有10.8千克水，倒入小桶2.8千克水后，大桶里的水和小桶里的水同样多，小桶里原来有多少千克水．
<gadget id="calculator">2.8 * 2</gadget>
<output>5.6</output>

<gadget id="calculator">10.8 - 5.6</gadget>
<output>5.2</output>

<result>5.2</result>