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    Question

    The average weight of 7 boxes P, Q, R, S, T, U and V is

    72kg. Another box A is added to group and the average now becomes 70kg. If another box C whose weight is 8 kg more than that of box A, replaces box P, then the average weight of Q, R, S, T, U, V, A and C becomes 69kg. Find the weight of box P?
    A 72 kg Correct Answer Incorrect Answer
    B 64 kg Correct Answer Incorrect Answer
    C 40 kg Correct Answer Incorrect Answer
    D 74 kg Correct Answer Incorrect Answer
    E 24 kg Correct Answer Incorrect Answer

    Solution

    (P + Q + R + S + T + U + V) = 7 ร— 72 = 504 kg (P + Q + R + S + T + U + V + A) = 8 ร— 70 = 560 kg A = 560 โ€“ 504 = 56 kg C = 56 + 8 = 64 kg (Q + R + S + T + U + V + A + C) = 8 ร— 69 = 552 kg Q + R + S + T + U + V + 56 + 64 = 552 Q + R + S + T + U + V = 552 โ€“ 56 โ€“ 64 = 432 P = 504 โ€“ 432 = 72 Kg

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