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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
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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20 Feb 2019, 05:14
00:00

Difficulty:

35% (medium)

Question Stats:

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

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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

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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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20 Feb 2019, 08:59
1
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
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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