Sum of the present ages of A, B and C =36×3+9=117 years …..(I)
Sum of the present ages of A and B = 76-4=72 years ……. (II)
From (I) & (II)
Present age of C = 117-72 = 45 years
Present age of A = 45+6=51 years
So, present age of B = 72-51=21 years
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