Given, Average age of A, B and C, 3 years ago = 45 Average age of A, B and C at present = 45 + 3 =48 Sum of ages of A, B and C (A + B + C) = 48 × 3 = 144 Given, Average age of B and C, 4 years ago = 35 Average age of B and C at present = 35 + 4 = 39 Sum of ages of B and C (B + C) = 39 × 2 = 78 Age of A at present= (A + B + C) - (B + C) = 144 - 78 = 66 Age of A after 4 years = 66 + 4 = 70 years. So, the age of A, after 4 years is 70 years. Hence, the correct answer is 70.