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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(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
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
