甲购大米5袋；面粉7袋850千克,乙购大米3袋；面粉1袋350千克,1袋大米和1袋面粉各

甲购大米5袋；面粉7袋850千克,乙购大米3袋；面粉1袋350千克,1袋大米和1袋面粉各
甲购大米5袋；面粉7袋850千克,乙购大米3袋；面粉1袋350千克,1袋大米和1袋面粉各

甲购大米5袋；面粉7袋850千克,乙购大米3袋；面粉1袋350千克,1袋大米和1袋面粉各
设大米每袋x千克,面粉每袋y千克,则有
5x+7y=850；
3x+y=350；
解得：x=100,y=50；
大米每袋100千克,面粉每袋50千克

1袋大米=(350x7-850)÷(3x7-5)=100千克
1袋面粉=350-100x3=50千克

大米=(350×7-850)÷(3×7-5)=100千克
面粉=350-100×3=50千克

设一袋大米的质量为X，
则一袋面粉质量为2X。
2X+5X=350
7X=350
X=50
面粉：2x50=100
答：一袋大米的质量是50千克;
一袋面粉的质量是100千克。

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