The first group of 10 children has a mean weight of 15.6 kg, the second group of another 10 children


the first group of 10 children has a mean weight of 15.6 kg, the second group of another 10 children has a mean weight of 16 kg, and the third group of children has a mean weight of 20 kg. if the mean weight of all the children is 17 kg, what is the total number of children in all of the three groups?


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