一桶汽油连桶重150千克,用去汽油的一半,连桶一起称还剩80千克,桶里原来有汽油多少千克?

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一桶汽油连桶重150千克,用去汽油的一半,连桶一起称还剩80千克,桶里原来有汽油多少千克?
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一桶汽油连桶重150千克,用去汽油的一半,连桶一起称还剩80千克,桶里原来有汽油多少千克?
一桶汽油连桶重150千克,用去汽油的一半,连桶一起称还剩80千克,桶里原来有汽油多少千克?

一桶汽油连桶重150千克,用去汽油的一半,连桶一起称还剩80千克,桶里原来有汽油多少千克?
一半减少了150-80=70千克
所以原来有汽油70÷1/2=140千克

（150-80)*2=140kg

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（150-80）*2

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