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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
Posts: 169

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

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30 Jun 2007, 01:24
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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

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Senior Manager
Joined: 04 Jun 2007
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30 Jun 2007, 01:42
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)

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Manager
Joined: 21 Mar 2007
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30 Jun 2007, 01:48
yes D 38 yrs 8 months

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VP
Joined: 08 Jun 2005
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30 Jun 2007, 02:02
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.

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Manager
Joined: 17 May 2007
Posts: 169

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30 Jun 2007, 10:04
yep got it. Answer is D.

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Director
Joined: 09 Aug 2006
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30 Jun 2007, 11:54
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..

Kudos [?]: 110 [0], given: 0

Re: Algebra   [#permalink] 30 Jun 2007, 11:54
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