A bottle of oil weighs 5.8 kilograms. After half of it is used up, the bottle still weighs 3.3 kilograms. How many kilograms does the bottle weigh?
一瓶油连瓶共重5.8千克，用去一半后，连瓶还重3.3千克，瓶重多少千克？
<gadget id="calculator">5.8 - 3.3</gadget>
<output>2.5</output>

<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">5.8 - 5</gadget>
<output>0.8</output>

<result>0.8</result>