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If x + y= 8z, then which of the following represents the ave

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If x + y= 8z, then which of the following represents the ave [#permalink] New post 19 Feb 2014, 00:21
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

97% (01:44) correct 2% (00:00) wrong based on 39 sessions
The Official Guide For GMAT® Quantitative Review, 2ND Edition

If x + y= 8z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z ?

(A) 2z + 1
(B) 3z
(C) 5z
(D) z/3
(E) 3z/2

Problem Solving
Question: 104
Category: Arithmetic Percents
Page: 75
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

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[Reveal] Spoiler: OA

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Re: If x + y= 8z, then which of the following represents the ave [#permalink] New post 19 Feb 2014, 00:21
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Re: If x + y= 8z, then which of the following represents the ave [#permalink] New post 19 Feb 2014, 01:48
Option B.
Average of x,y and z=>(x+y+z)/3
x+y=8z(given)
Replacing we get,9z/3=3z
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Re: If x + y= 8z, then which of the following represents the ave [#permalink] New post 22 Feb 2014, 05:06
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Re: If x + y= 8z, then which of the following represents the ave [#permalink] New post 24 Feb 2014, 04:06
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

If x + y= 8z, then which of the following represents the average (arithmetic mean) of x, y, and z, in terms of z ?

(A) 2z + 1
(B) 3z
(C) 5z
(D) z/3
(E) 3z/2

Problem Solving
Question: 104
Category: Arithmetic Percents
Page: 75
Difficulty: 550


GMAT Club is introducing a new project: The Official Guide For GMAT® Quantitative Review, 2ND Edition - Quantitative Questions Project

Each week we'll be posting several questions from The Official Guide For GMAT® Quantitative Review, 2ND Edition and then after couple of days we'll provide Official Answer (OA) to them along with a slution.

We'll be glad if you participate in development of this project:
1. Please provide your solutions to the questions;
2. Please vote for the best solutions by pressing Kudos button;
3. Please vote for the questions themselves by pressing Kudos button;
4. Please share your views on difficulty level of the questions, so that we have most precise evaluation.

Thank you!



Average of x,y,z is (x+y+z)/3=(8z+z)/3=3z
:)
Re: If x + y= 8z, then which of the following represents the ave   [#permalink] 24 Feb 2014, 04:06
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