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Let the three numbers be a, b and c respectively. According to question; (a + b + 2c) = 130 × 2 = 260……………..(1) (a + 2b + c) = 142 × 2 = 284……………..(2) (2a + b + c) = 154 × 2 = 308……………..(3) From equation (1), (2) and (3) 4 × (a + b + c) = 852 a + b + c = 213 (a + b + c)/3 = 71