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

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If x+y=8z, then which of the following represents the averag [#permalink] New post 08 Feb 2011, 03:40
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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
[Reveal] Spoiler: OA
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If x+y=8z, then which of the following represents the averag [#permalink] New post 08 Feb 2011, 04:01
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Lolaergasheva wrote:
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


The average of x, y and z equals to (x+y+z)/3 as x+y=8z then (x+y+)z/3=(8z+z)/3=9z/3=3z.

Answer: B.
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If x+y=8z then which of the following represents [#permalink] New post 26 Jan 2013, 07:01
If x+y=8z then which of the following represents the arithmetric mean of x,y and z interms of z?

A.2z+1 B.3z C.5z D.z/3 E.3z/2
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Re: If x+y=8z then which of the following represents [#permalink] New post 26 Jan 2013, 07:22
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Arithmetic mean of x, y and z = (x+y+z)/3
x+y = 8z so x+y+z = 8z + z = 9z.
Arithmetic mean = 9z/3 = 3z.

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Re: If x+y=8z then which of the following represents [#permalink] New post 26 Jan 2013, 08:40
chiccufrazer1 wrote:
If x+y=8z then which of the following represents the arithmetric mean of x,y and z interms of z?

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


Merging similar topics. Refer to the solutions above.
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PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

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PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!


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Re: If x+y=8z then which of the following represents   [#permalink] 26 Jan 2013, 08:40
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