barrel of gasoline weighs 11.23 kilograms. After half of the gasoline is used, the remaining gasoline weighs 7 kilograms. How many kilograms of gasoline are there in the barrel?
一桶汽油连桶共重11.23千克，用去一半汽油后，剩下的汽油连桶共重7千克，原来油桶中有多少千克汽油？
<gadget id="calculator">11.23 - 7</gadget>
<output>4.23</output>

<gadget id="calculator">4.23 * 2</gadget>
<output>8.46</output>

<result>8.46</result>