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co 3 thung dau a b c chua tat ca 360 l dau biet so dau thung a hon 2/9
tong so dau 3 thung la 30 l tinh so dau thung a nau chuyen 1/5 so au thung b sang thung c va them 10 l dau vao thung c thi luc nay so dau thung b bang 6/7 so dau thung c hoi luc dau moi thung co bao nhieu l dau b c
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