There are two barrels of oil. The oil in barrel A originally weighed 10 kilograms. After pouring out 1.2 kilograms, it is 2.8 kilograms less than twice the oil in barrel B. How much does the oil in barrel B weigh in kilograms?
有两桶油，甲桶油原来重10千克，倒出1.2千克后，比乙桶油的2倍少2.8千克，乙捅油重多少千克？
<gadget id="calculator">10 - 1.2</gadget>
<output>8.8</output>

<gadget id="calculator">8.8 + 2.8</gadget>
<output>11.6</output>

<gadget id="calculator">11.6 / 2</gadget>
<output>5.8</output>

<result>5.8</result>