There is water in a bucket, and the weight of the bucket is 5 kg. Add water to 4 times the original weight, and the weight of the bucket is 11 kg. How many kilograms of water are in the original bucket?
一个水桶里面装有水，连桶重5千克，把水加到原来的4倍，连桶重11千克，原来桶里有多少千克水？
<gadget id="calculator">11 - 5</gadget>
<output>6</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">6 / 3</gadget>
<output>2</output>

<result>2</result>