Question
Arjun is three years senior to Binny, who is twice as
old as Chinu. If the average age of Arjun, Binny, and Chinu is 21 years, what is the age difference between Binny and Chinu?Solution
Total age of Arjun, Binny and Chinu = 21 × 3 = 63 years Let the age of Chinu be‘c’ years Age of Binny = ‘2c’ years Age of Arjun = ‘2c + 3’ years According to the question, 2c + 3 + 2c + c = 63 5c + 3 = 63 5c = 60 c = 12 Age of Binny = 24 years Age of Chinu = 12 years Required difference = 24 – 12 = 12 years
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