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The average height of 74 students in a class is 168 cm out of which 42

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Math Expert
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Joined: 02 Sep 2009
Posts: 58452
The average height of 74 students in a class is 168 cm out of which 42  [#permalink]

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New post 20 Feb 2019, 05:14
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A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

73% (02:13) correct 27% (02:15) wrong based on 15 sessions

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Joined: 18 Aug 2017
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Location: India
Concentration: Sustainability, Marketing
GPA: 4
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Re: The average height of 74 students in a class is 168 cm out of which 42  [#permalink]

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New post 20 Feb 2019, 08:59
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Bunuel wrote:
The average height of 74 students in a class is 168 cm out of which 42 students had an average height of 170 cm. Find the average height of the remaining 32 students rounded to the nearest integer.

A. 175
B. 170
C. 165
D. 155
E. 145



total sum of height ; 74* 168 = 12432
sum of heights of 42 students = 42 * 170 ; 7140
so sum of heights of 32 students = 12432-7140 ; 5292
avg ; 5292/ 32 ; ~ 165
IMO C
GMAT Club Bot
Re: The average height of 74 students in a class is 168 cm out of which 42   [#permalink] 20 Feb 2019, 08:59
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The average height of 74 students in a class is 168 cm out of which 42

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