The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group

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The average weight of 3 men, A, B and C is 84 kg. Another man D joins the group and the average now becomes 80 kg. If another man E whose weight is 3 kg more than that of D, replaces A then the average weight of B, C, D and E becomes 79 kg. What is the weight of A ?

Options:

A . 70 kg

B . 72 kg

C . 75 kg

D . 80 kg

Answer: Option C

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