Question : The average weight of three 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. Then the weight of A is:
Option 1: 72 kg
Option 2: 74 kg
Option 3: 75 kg
Option 4: 76 kg
Correct Answer: 75 kg
Solution : The average weight of three men A, B, and C is 84 kg. $\therefore$ The total weight of A, B, and C = 84 × 3 = 252 kg Now, D joins the group and the average now becomes 80 kg. $\therefore$ Weight of D = (80 × 4) – 252 = 68 kg E's weight is 3 kg more than that of D. So, E's weight = 68 + 3 = 71 kg He replaces A. The average weight of B, C, D, and E becomes 79 kg. So, the weight of (B + C) = (79 × 4) – (68 + 71) = 177 kg $\therefore$ Weight of A = 252 – 177 = 75 kg Hence, the correct answer is 75 kg.
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Question : The average weight of three 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. Then the
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Question : The average weight of a group of 3 people A, B and C is 70 kg. When D joins this group, the average becomes 60 kg. A man E, whose weight is 5 kg more than that of D, replaces A and the average weight of B, C, D, and E now becomes 59 kg. What is the average weight (in kg) of A,
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