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A:B {multiplying A and B with 9} 5:4 B:C {multiplying B and C with 4} 9:10 we get A:B:C = 45:36:40 A+B+C = 45+36+40 = 121 units 121 units = 2420 1 unit = 20 amount with C = 40 units = 40 × 20 = 800
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