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What is the average (arithmetic mean) of x, y, and z ?

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What is the average (arithmetic mean) of x, y, and z ?  [#permalink]

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New post 31 Oct 2018, 10:37
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A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

77% (01:05) correct 23% (01:10) wrong based on 44 sessions

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Joined: 09 Jun 2018
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Re: What is the average (arithmetic mean) of x, y, and z ?  [#permalink]

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New post 31 Oct 2018, 10:46
Stmt 1: x + y = 5, does not give us a way to find (x + y + z)/3, hence insuff. Eliminate A,D
Stmt 2: y + z = 7, does not give us a way to find (x + y + z)/3, hence eliminate B.

Combined: we can only get either x-z or x + 2y + z, but cannot find (x+y+z)/3, hence insuff, eliminate C.

Option E
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Re: What is the average (arithmetic mean) of x, y, and z ? &nbs [#permalink] 31 Oct 2018, 10:46
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