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Discussion

  1. The average weight of three men A, B and C is 84 kg. Another man D joins the group and the new average becomes 80 kg if another man E, whose weight is 3kg more than that of D, replace A, then the average weight of B , C, D and E becomes 79 kg. the weight of A is ?
    1. 70 kg
    2. 72 kg
    3. 75 kg
    4. 80 kg
  1. Correct Option: C

    From question
    A + B + C = 3 x 84 = 252 ....(i)
    A + B + C + D = 4 x 80 = 320 ...(ii)
    From eq. (ii) - (i)
    D = ( 320 - 252 ) = 68

    From question E = D + 3
    ⇒ E =( 68 + 3 ) = 71

    Now , B + C + D + E = 4 x 79 = 316
    ∴ B + C + D = 316 – 71 = 245
    So , A = 320 - 245 = 75 kg .

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