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[(90+80+50+80+40)-(70+70+30+50+40)]/5=16

80-16=64
Nothing is really over until the moment you stop trying.

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[讨论]

I am not quite sure if the following way is the correct solution.
(70+70+30+50+40) /(90+80+50+80+40) =  13/17
80*(13/17)=61.2

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who can give me the detail in solving this problem?

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How can I resolve this problem? Your help is really appreciated.

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好像答案部队,是64来着
Nothing is really over until the moment you stop trying.

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