The avg age of class of 20 students in 20 years If the lecturer rsquo s age is added to the avg incr...........

Quantitative Aptitude ( CCS) Problems based on Ages

The avg age of class of 20 students in 20 years. If the lecturer’s age is added to the avg, increases by one. What is the age of the lecturer?

Average x Number = Total Years
20 x 20 = 400 …(1)
21 x 21 = 441 …(2)
Lecturer’s age =Eqn (2) -Eqn (1)
= 441 – 400
= 41 years.

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