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?  Select:
A) 37
B) 38
C) 47
D) 51
E) 41
41   41   Average x Number = Total Years   20 x 20 = 400 …(1)   21 x 21 = 441 …(2)   Lecturer’s age =41qn (2) -41qn (1)   = 441 – 400   = 41 years.
<result>E</result>
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?