barrel of oil weighs 100 kilograms. After half of the oil is used, the barrel still weighs 51.8 kilograms. How many kilograms of oil are there?
一桶油连桶共重100千克，用去油的一半后，连桶还重51.8千克，原来有油多少千克．
<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>