Give stream of consciousness and then the final answer. The average age of a class of 39 students is 15 years. If the age of the teacher be included, then the average increases by 3 months .Find the age of the teacher.\nOptions:\n(A) 22\n(B) 25\n(C) 8\n(D) 27\n(E) 19
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Sum of the ages of the students = 39×15 = 585\nNew average = 15 years 3 months = 15 + 1414 year\nSum of the ages of students and teacher = 40×15141514 = 40×614614 = 610\nTeacher age = 610 – 585 = 25 years.
The final answer: (B).
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