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The average age of a committee of eight members is 40 years. A members

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The average age of a committee of eight members is 40 years. A members  [#permalink]

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New post 20 Feb 2019, 04:57
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The average age of a committee of eight members is 40 years. A members aged 55 years retired and his place was taken by another member aged 39 years. The average age of the present committee is :

A. 39 years
B. 38 years
C. 36 years
D. 35 years
E. 34 years


The average age of a committee of 8 members is 40 years. A member, aged 55 years, retired and he was replaced by a member aged 39 years. The average age of the present committee is?

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The average age of a committee of eight members is 40 years. A members  [#permalink]

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New post 20 Feb 2019, 05:06
Difference in age of last person = 55-39 = 16
This change will be distributed among all 8 members, hence the average of group reduced by 16/8 = 2 years
So avg age of present committee = 40-2 = 38 years
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Re: The average age of a committee of eight members is 40 years. A members  [#permalink]

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New post 20 Feb 2019, 09:10
Bunuel wrote:
The average age of a committee of eight members is 40 years. A members aged 55 years retired and his place was taken by another member aged 39 years. The average age of the present committee is :

A. 39 years
B. 38 years
C. 36 years
D. 35 years
E. 34 years


The average age of a committee of 8 members is 40 years. A member, aged 55 years, retired and he was replaced by a member aged 39 years. The average age of the present committee is?


sum of present committee age = 320
so now 55 years old person leaves = new sum ; 320-55; 265
and 39 yr old person comes ; 265+39 ; 304
new avg ; 304/8 = 38
IMO B
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Re: The average age of a committee of eight members is 40 years. A members   [#permalink] 20 Feb 2019, 09:10
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