The average age of a class of 40 students is 15 yrs. if the teacher's age is also included, the average increases by one year. Find the age of the teacher\nOptions:\n(A) 30 Years\n(B) 56 Years\n(C) 32 Years\n(D) 34 Years\n(E) 49 Years Let's think first. Stream of consciousness:
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Total age of students is 40X15 = 600 Years\nTotal age inclusive of teacher = 41X (15+1) = 656\nSo, Teacher's age is 656-600 = 56 Yrs\nThere is a shortcut for these type of problems\nTeacher's age is 15+(41X1) = 56 Years
So, the answer is (B).
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