the average weight of 3 groups of friends of 50, 30 & 20 members respectiv

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Question

the average weight of 3 groups of friends of 50, 30 & 20 members respectively, are 50 kg 52 kg and 55 kg. what is the average weight of all the friends taken together?

Options:

A . 45.34 kg

B . 49.24 kg

C . 50.57 kg

D . 51.6 kg

Answer: Option D
Explanation :

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