The average weight of four boys A, B, C, and D is 75 kg. The fifth boy E is included and the average weight decreases by 4 kg. A is replaced by F. The weight of F is 6 kg more than E. Average weight decreases because of the replacement of A and now the average weight is 72 kg. Find the weight of A.
1) 57 kg
2) 54 kg
3) 56 kg
4) 60 kg
5) 58 kg

• Sum of the weight of A, B, C and D = 75 × 4 = 300 kg
  and average weight of A, B, C, D and E = 71 kg
  sum of the weight of A, B, C, D and E
  = 71 × 5 = 355 kg
  weight of E = 355 – 300 = 55 kg
  weight of F = 55 + 6 = 61 kg
  Now, average weight of F, B, C, D and E = 72 kg
  Sum of the weight of F, B, C, D and E = 72 × 5 = 360 kg
  B + C + D = 360 – 55 – 61 = 244 kg.
  Weight of A = 300 – 244 = 56 kg.
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