barrel of kerosene weighs 80.2 kilograms. After selling half of the kerosene, the barrel still weighs 42.4 kilograms. How many kilograms does this barrel of kerosene weigh?
一桶煤油连桶重80.2千克，卖出煤油的一半后，连桶还重42.4千克，这桶煤油重多少千克？
<gadget id="calculator">80.2 - 42.4</gadget>
<output>37.8</output>

<gadget id="calculator">37.8 * 2</gadget>
<output>75.6</output>

<result>75.6</result>