A bucket of water weighs 9 kg. After half of the water is poured out, the weight of the bucket is 5.2 kg. What is the weight of the bucket?
一桶水连桶重9千克，倒掉一半水后，连桶重5.2千克，这个桶重多少千克．
<gadget id="calculator">9 - 5.2</gadget>
<output>3.8</output>

<gadget id="calculator">3.8 * 2</gadget>
<output>7.6</output>

<gadget id="calculator">9 - 7.6</gadget>
<output>1.4</output>

<result>1.4</result>