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Teachers and classmates in math class
(1) master age = apprentice age *2-2

(2) Master age+(Master age-apprentice age) =4 1.

Substitute (1) into (2) to obtain

2* (apprentice age *2-2)- apprentice age =4 1.

3* The age of the apprentice =4 1+4=45.

Apprentice age = 15 years old.

Master's age = 15*2-2=28 years old.