Ratio sum = 4 + 3 = 7. 7x = 42, x = 6. Age of A = 4 x 6 = 24 years.
अनुपात योग = 4 + 3 = 7। 7x = 42, x = 6। A की आयु = 4 x 6 = 24 वर्ष।