(3) Suppose the age of Johnny is x years and that of Rahul is y years. According to question Age of Hari = 2x = 5y or, 2x – 5y = 0 ...(i) Again x = 3 + y or, x – y = 3 ... (ii) On solving equations (i) and (ii), we get y = 2∴ Age of Johnny = 3+y = 3 + 2 = 5 years