If a: B: C = 2:3:4 and a + B + C = 27, then a-2b-3c=______ ．

Let a = 2x, then B = 3x, C = 4x, then 2x + 3x + 4x = 27, the solution is x = 3, then a = 6, B = 9, C = 12, then - 2b-3c = 6-2 × 9-3 × 12 = 6-18-36 = - 48

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