Solution:Let the present age of A is A years.According to the question,
(A - 2) = 3 (B - 2)
โ A - 2 = 3 (9 - 2) (โด Present age of B is given)
โ A - 2 = 21 โ A = 23 years.
Let after t years, the age of A will be double of the age of B,
(23 + t) = 2 (9 + t)
โ 23 + t = 18 + 2t โ t = 23 - 18 = 5
โด After 5 years the age of A will become double of the age of B.