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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 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 all the children is 53.2 kg. How many girls are there?

User Turkenh
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User OC Rickard
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