A man is 5 times as old as his son. In 15 years he will be twice as old. Find son's present age. / एक आदमी अपने पुत्र से 5 गुना बड़ा है। 15 वर्षों बाद वह दुगना होगा। पुत्र की वर्तमान आयु ज्ञात कीजिए।
Correct: A
Let son's age = x, man's = 5x. After 15 years: 5x + 15 = 2(x + 15) → 5x + 15 = 2x + 30 → 3x = 15 → x = 5