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The sum of the weight of 4 persons = 56 × 4 = 224 kg Let the weight of the lightest person = ‘x’ kg The weight of the heaviest person = (x + 30) kg The sum of the weight of the remaining two persons = 55 × 2 = 110 kg According to the question, x + x + 30 + 110 = 224 2x = 84 x = 42 The weight of the heaviest person = 42 + 30 = 72 kg