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Total weight of friends A, B, C, D and E = 5(x+8) kg Total weight of friends C, and E = 2(x- 8) kg So, Total weight of A, B and D = 5(x+8) - 2(x-8) = (3x+56) kg Weight of F = [(x+8-7)×6] - [5(x+8)] => F = (x-34) kg According to the question, => (3x+56) + (x-34) = 92.5 × 4 => 4x + 22 = 370 => 4x = 348 => x = 87
50 ÷ 2.5 × 64 + ? = 1520