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# The average age of an adult class is 40 years. 12 new students with an

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Math Expert
Joined: 02 Sep 2009
Posts: 58446
The average age of an adult class is 40 years. 12 new students with an  [#permalink]

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21 Feb 2019, 00:25
00:00

Difficulty:

25% (medium)

Question Stats:

86% (02:23) correct 14% (03:58) wrong based on 14 sessions

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The average age of an adult class is 40 years. 12 new students with an average of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was :

A. 10
B. 11
C. 12
D. 15
E. 15

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Re: The average age of an adult class is 40 years. 12 new students with an  [#permalink]

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21 Feb 2019, 09:15
Bunuel wrote:
The average age of an adult class is 40 years. 12 new students with an average of 32 years join the class, thereby decreasing the average by 4 years. The original strength of the class was :

A. 10
B. 11
C. 12
D. 15
E. 15

sum of n/ n = 40
40n= sum
x+384/n+12 = 36
40n+384=36n+432
n= 12
IMO C
Re: The average age of an adult class is 40 years. 12 new students with an   [#permalink] 21 Feb 2019, 09:15
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