一桶水如果用同样大小的瓶去装,装满8瓶后,桶内还剩7分之6.装满7瓶,桶内还剩2分之49千克,这桶水有多少千

一桶水如果用同样大小的瓶去装,装满8瓶后,桶内还剩7分之6.装满7瓶,桶内还剩2分之49千克,这桶水有多少千
一桶水如果用同样大小的瓶去装,装满8瓶后,桶内还剩7分之6.装满7瓶,桶内还剩2分之49千克,这桶水有多少千

一桶水如果用同样大小的瓶去装,装满8瓶后,桶内还剩7分之6.装满7瓶,桶内还剩2分之49千克,这桶水有多少千
1-7分之6=7分之1
8÷7分之1=56（桶）
56-7=49（桶）
求一桶重量：2分之49÷49=2分之1千克
56×2分之1=28千克

剩6/7是指全桶水的6/7 49/2kg是实际重量哦
先设同样大小的瓶可装a KG水,整桶水是b KG
8a=1/7b -->a=b/56
7a+ 49/2=b
--> 7*1/56 b+ 49/2=b
1/8b+ 49/2=b
49/2=7/8 b
b=28KG
这桶水有28KG重

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