The ratio of ages of A and B is 4 : 5. After 5 years, the ratio becomes 5 : 6. Find the sum of their present ages.

माना आयु 4x और 5x है। (4x+5)/(5x+5) = 5/6 -> 24x + 30 = 25x + 25 -> x = 5। योग = 4(5) + 5(5) = 20 + 25 = 45 वर्ष।