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

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


Explain your answer
Senior Manager
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Re: Algebra [#permalink] New post 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


Explain your answer


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
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 [#permalink] New post 30 Jun 2007, 00:48
yes D 38 yrs 8 months
VP
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 [#permalink] New post 30 Jun 2007, 01:02
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.

the answer is (D)

:-D
Manager
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 [#permalink] New post 30 Jun 2007, 09:04
yep got it. Answer is D.
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Re: Algebra [#permalink] New post 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


Explain your answer


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