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The average weight of 3 men A ,\ B an...

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. The weight of `A` is (a) 70 kg (b) 72 kg (c) 75 kg (d) 80 kg

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75 kg
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