Option 3 : 92 years

**Given:**

The present age of A is 56 years more than the present age of B

**Calculation:**

Let the present ages of A, B, C, and D be a, b, c, and d years

⇒ a = 56 + b ..... (1)

⇒ a - 5 = 2 × (c + 2)

⇒ a = 2c + 9 .... (2)

⇒ b + 6 = c - 4,

⇒ b = c - 10 .... (3)

⇒ from (1), (2), and (3)

⇒ c = 37, b = 27, a = 83

⇒ a - d = d - b

⇒ 2d = a + b = 83 + 27 = 110

⇒ d = 55

⇒ The sum of age of C and D = c + d = 37 + 55 = 92

**∴ The required result will be 92.**