A 50 years old man has a son whose age is 2/5 of that person’s age. After how many years will the average of a person become 5/3 of that his son?

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The UGC NET General Paper on Teaching & Research Aptitude is an exam designed to test the teaching and research skills of Indian teachers to determine their eligibility for college lectureship. 
 


A 50 years old man has a son whose age is 2/5 of that person’s age. After how many years will the average of a person become 5/3 of that his son?