Question
The mass of 3 boxes of black bean and a bag of sesame seed is 14 kg. The mass of each box of black bean is 3 kg. The mass of a bag of sesame seed is         .
4 m

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The mass of 3 boxes of black bean and a bag of sesame seed is 14 kg. The mass of each box of black bean is 3 kg. The mass of a bag of sesame seed is         .