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The average weight of A, B and C is 72 kg. When D joins them, the new average becomes 68 kg. When E joins, A, B, C and D, the average of all five becomes 70 kg. What is the weight of E?
  • a)
    78 kg
  • b)
    80 kg
  • c)
    84 kg
  • d)
    85 kg
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
The average weight of A, B and C is 72 kg. When D joins them, the new ...
The average weight of A, B, C and D = 68 kg
The average weight of A, B, C, D and E = 70 kg
So the answer = 70 × 5 – 68 × 4 = 78 kg
Hence, Option A is correct.
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