A barrel of oil, together with the barrel, weighs 51.2 kilograms. After half of the oil is poured out, the weight of the barrel is 26.2 kilograms. What is the mass of the barrel in kilograms?
一桶油，连桶一起共重51.2千克，倒出一半油后，连桶重26.2千克．桶的质量是多少千克？
<gadget id="calculator">51.2 - 26.2</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<gadget id="calculator">51.2 - 50</gadget>
<output>1.2</output>

<result>1.2</result>