A barrel of oil weighs 25.3 kilograms. After half of it is used up, the barrel still weighs 13.7 kilograms. How many kilograms of oil are in the original barrel?
一桶油连桶共重25.3千克，用去一半后，连桶还重13.7千克，原来的桶里有油多少千克？
<gadget id="calculator">25.3 - 13.7</gadget>
<output>11.6</output>

<gadget id="calculator">11.6 * 2</gadget>
<output>23.2</output>

<result>23.2</result>