SOLUTION: The average age of a group went up by 2 years when a man aged 34 years was replaced by an old man aged 58 years How many members were there in the group?
(A)10
(B)12
(C)18
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Question 815463: The average age of a group went up by 2 years when a man aged 34 years was replaced by an old man aged 58 years How many members were there in the group?
(A)10
(B)12
(C)18
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The average age of a group went up by 2 years when a man aged 34 years was replaced by an old man aged 58 years
How many members were there in the group?
:
Let n = number of men in the group, assume they are all 34 yrs old
:
= 34 + 2
34(n-1) + 58 = 36n
34n - 34 + 58 = 36n
24 = 36n - 32n
24 = 2n
n = 12 members in the group
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