∵ 2A = 3B and 4B = 5C ⇒ 8A = 12B and 12B = 15C⇒ 8A = 12B = 15C = x ∴ A = x/8, B = x/12, C = x/15 So, A : C = x/8 : x/15 = 15 : 8
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