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    Question

    The average weight of Mandar, Ketan and Tushar is 45 kg.

    If the average weight of Mandar and Ketan be 43 kg and that of Ketan and Tushar be 48 kg, then the weight of Ketan (in kg) is:
    A 62 Correct Answer Incorrect Answer
    B 47 Correct Answer Incorrect Answer
    C 67 Correct Answer Incorrect Answer
    D 57 Correct Answer Incorrect Answer

    Solution

    Average of Mandar, Ketan, Tushar = 45 тЗТ M + K + T = 45 ├Ч 3 = 135 Average of Mandar and Ketan = 43 тЗТ M + K = 86 Average of Ketan and Tushar = 48 тЗТ K + T = 96 Add the last two equations: (M + K) + (K + T) = 86 + 96 M + 2K + T = 182 But M + K + T = 135 Subtract: (M + 2K + T) тИТ (M + K + T) = 182 тИТ 135 K = 47

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