A barrel of oil with barrels weighs 9.8 kilograms. After half of the oil is poured out, the barrels still weigh 5.4 kilograms. How many kilograms does the barrel weigh?
一桶油连桶共重9.8千克，倒出一半油以后，连桶还重5.4千克，桶重多少千克．
<gadget id="calculator">9.8 - 5.4</gadget>
<output>4.4</output>

<gadget id="calculator">5.4 - 4.4</gadget>
<output>1</output>

<result>1</result>