The average age of 11 students and their teacher is 20 yrs The average age of the first six students...........

Quantitative Aptitude (RBI Grade B) Problems based on Ages

The average age of 11 students and their teacher is 20 yrs. The average age of the first six students is 22 yrs and that of the last five is 16 yrs. The teacher’s age is ?

28yrs

32yrs

30yrs

35yrs

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Explanation:

Solution:
Total age of 11 students and a teacher = 12 x 20 = 240 yrs
Total age of first 6 students = 6 x 22 = 132 yrs
and total age of last 4 students = 5 x 16= 80 yrs
Age of teacher = 240 – 132 – 80 = 28 yrs.

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