Answer :

Let say


A =x/3


B = x/4


C = x/6


A + B + C = 180


x/3 + x/4 + x/6 = 180


(4x + 3x + 2x)/12 = 180


9x/12 = 180


X= 240


A =x/3 = 240/3 = 80


B = x/4 = 240/4 = 60


C = x/6 = 240/6 = 40


So, A:B:C = 4:3:2

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