A barrel of oil, including the barrels, weighs 100 kilograms. After half of the oil is used, the barrels still weigh 51.8 kilograms. How many kilograms of original oil is in the barrel?
一桶油，连桶共重100千克，油用去一半后，连桶还重51.8千克．桶内原有油多少千克？
<gadget id="calculator">100 - 51.8</gadget>
<output>48.2</output>

<gadget id="calculator">48.2 * 2</gadget>
<output>96.4</output>

<result>96.4</result>