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A + b + c / 3 = 50 a + b + c = 150 -- Eq.1 a + b / 2 = 40 a + b = 80 -- Eq.2 b + c / 2 = 45b + c = 90 -- Eq.3 Eq.1 - Eq.2 a + b + c - a - b = 150 - 80c = 70 Eq.1 - Eq.3a + b + c - b - c = 150 - 90a = 60 Putting these values in Eq.1a + b + c = 15060 + b + 70 = 150130 + b = 150b = 150 - 130b = 20 kg