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(A) 3m + 5d = 28.1; (B) 2m + 4d = 21.4 Multiply A by 2 and B by 3 (C) 6m + 10d = 56.2, (D) 6m + 12d = 64.2 Subtract C from D 2d = 8 so d = 4 and m = 16.2/6 = 2.7 Check using A & B: A: 3 x 2.7 + 5 x 4 = 8.1 + 20 = 28.1 B ; 2 x 2.7 + 4 x 4 = 5.4 + 16 = 21.4 QED

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