Mathematics, 15.10.2019 09:30 u8p4

The mean mass of 8 boys is 55 kg and the mean mass of a group of girls is 52 kg. the mean mass of all the children is 53.2 kg. how many girls are there?

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The mean mass of 8 boys is 55 kg and the mean mass of a group of girls is 52 kg. the mean mass of al...

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