The ratio of the ages of X and Y is 7 : 3. After 4 years, the ratio becomes 2 : 1. What is the present age of X?

माना आयु 7a और 3a है। (7a + 4) / (3a + 4) = 2/1 -> 7a + 4 = 6a + 8 -> a = 4। X की आयु = 7 * 4 = 28 वर्ष।