The ratio of the ages of A and B is 4 : 3. After 6 years, their ages will be in the ratio 11 : 9. Find A's present age.

मान लीजिए आयु 4x, 3x है। (4x+6)/(3x+6) = 11/9 => 36x + 54 = 33x + 66 => 3x = 12 => x = 4। A की आयु = 4*4 = 16 वर्ष।