A : B = 3 : 5 = 12 : 20B : C = 4 : 7 = 20 : 35∴ A : B : C = 12 : 20 : 35Second Method :A : B : C = xp : yp : qy= 3 × 4 : 5 × 4 : 5 × 7= 12 : 20 : 35
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