Question
The mass of 2 bags of sesame seed and a box of potato starch is 15 kg. The mass of each bag of sesame seed is 2 kg. The mass of a box of potato starch is         .
4 m

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The mass of 2 bags of sesame seed and a box of potato starch is 15 kg. The mass of each bag of sesame seed is 2 kg. The mass of a box of potato starch is         .