Question
The mass of 2 boxes of flour and a packet of corn starch is 11 kg. The mass of each box of flour is 4 kg. The mass of a packet of corn starch is         .
4 m

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The mass of 2 boxes of flour and a packet of corn starch is 11 kg. The mass of each box of flour is 4 kg. The mass of a packet of corn starch is         .