anybody help me please ,about math一桶油连桶重10千克,倒出一半后,连桶还重5.5千克,原来有油多少千克?

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anybody help me please ,about math一桶油连桶重10千克,倒出一半后,连桶还重5.5千克,原来有油多少千克?
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anybody help me please ,about math一桶油连桶重10千克,倒出一半后,连桶还重5.5千克,原来有油多少千克?
anybody help me please ,about math
一桶油连桶重10千克,倒出一半后,连桶还重5.5千克,原来有油多少千克?

anybody help me please ,about math一桶油连桶重10千克,倒出一半后,连桶还重5.5千克,原来有油多少千克?
(10-5.5)×2=9(千克)
答:原来有油9千克.