A father is 30 years older than his son. In 5 years, the father's age will be three times the age of his son. What is the father's current age?

माना पुत्र की आयु x है। पिता x+30 है। 5 वर्षों में: (x+30)+5 = 3(x+5)। x+35 = 3x+15। 2x = 20, इसलिए x=10। पिता की आयु = 10+30 = 40 वर्ष।