Question
The mass of 3 boxes of soya bean and a packet of peppercorn is 9 kg. The mass of each box of soya bean is 2 kg. The mass of a packet of peppercorn is         .
4 m

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The mass of 3 boxes of soya bean and a packet of peppercorn is 9 kg. The mass of each box of soya bean is 2 kg. The mass of a packet of peppercorn is         .