please help me!锅炉房现存的煤,估计这一段时期内每天用5.5吨煤,则可以剩下90吨,每天用6吨,则可剩下30吨,存煤多少吨?
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please help me!锅炉房现存的煤,估计这一段时期内每天用5.5吨煤,则可以剩下90吨,每天用6吨,则可剩下30吨,存煤多少吨?
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