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# The average age of the 50 members of a certain health club

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Manager
Joined: 17 May 2007
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The average age of the 50 members of a certain health club [#permalink]  30 Jun 2007, 00:24
The average age of the 50 members of a certain health club is 36 years . The club has a 20 person yoga class and the people in it have an average age of 32 years. What is the average age of the club members not in yoga class.

(A) 34 Years 5 Months
(B) 37 Years 9 Months
(C) 38 Years
(D) 38 Years 8 Months
(E) 40 Years

Senior Manager
Joined: 04 Jun 2007
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Re: Algebra [#permalink]  30 Jun 2007, 00:42
vay wrote:
The average age of the 50 members of a certain health club is 36 years . The club has a 20 person yoga class and the people in it have an average age of 32 years. What is the average age of the club members not in yoga class.

(A) 34 Years 5 Months
(B) 37 Years 9 Months
(C) 38 Years
(D) 38 Years 8 Months
(E) 40 Years

It is D.

total age of club members not in yoga class=36*50-32*20=1160 years
Therefore, average age= 1160/30=38 years 8 months (2/3 years)
Manager
Joined: 21 Mar 2007
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yes D 38 yrs 8 months
VP
Joined: 08 Jun 2005
Posts: 1147
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My two cents -

sum of ages in the club:

50*36 = 1,800

sum of ages in yoga class:

20*32 = 640

The club members not in yoga class:

(1800-640)/(50-20) = 1160/30 = 38 years and 8 months.

Manager
Joined: 17 May 2007
Posts: 179
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Kudos [?]: 7 [0], given: 0

yep got it. Answer is D.
Director
Joined: 09 Aug 2006
Posts: 525
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Re: Algebra [#permalink]  30 Jun 2007, 10:54
vay wrote:
The average age of the 50 members of a certain health club is 36 years . The club has a 20 person yoga class and the people in it have an average age of 32 years. What is the average age of the club members not in yoga class.

(A) 34 Years 5 Months
(B) 37 Years 9 Months
(C) 38 Years
(D) 38 Years 8 Months
(E) 40 Years

One more D..same explanation..
Re: Algebra   [#permalink] 30 Jun 2007, 10:54
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