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If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0

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If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 03 Dec 2015, 05:59
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A
B
C
D
E

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93% (00:22) correct 7% (00:19) wrong based on 155 sessions

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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 03 Dec 2015, 06:09
(x+2 + x+4 + x+6)/3 = 0
=>3x + 12 = 0
=>x = -4

Answer A
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 03 Dec 2015, 11:10
Bunuel wrote:
If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0, then x =


A. –4
B. –3
C. –2
D. –1
E. 0


Skywalker18's approach is the one I would have taken, but we can also TEST THE ANSWER CHOICES

A) x = -4
The three values become (-4 + 2), (-4 + 4), and (-4 + 6)
Simplify to get: -2, 0 and 2
The average = (-2 + 0 + 2)/3 = 0/3 = 0
Perfect!

Answer: A

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Brent
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 03 Dec 2015, 21:53
1
Bunuel wrote:
If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0, then x =


A. –4
B. –3
C. –2
D. –1
E. 0



As it is an evenly spaced set with odd number of elements, hence the mean will be the middle term which is x+4 and as given

x+4 = 0
=> x = -4

Hence A is the answer.
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 29 Apr 2016, 05:37
If average of 3 numbers is equal to 0 then there total is also equal to 0

\(\frac{(x+2+x+4+x+6)}{3}\) = 0

\(3x+12=0\)
\(3x=-12\)
\(x=-4\)

Correct answer - A
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 29 Apr 2016, 05:38
If average of 3 numbers is equal to 0 then there total is also equal to 0

\(\frac{(x+2+x+4+x+6)}{3}\) = 0

\(3x+12=0\)
\(3x=-12\)
\(x=-4\)

Correct answer - A
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0 [#permalink]

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New post 11 Mar 2018, 11:09
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Re: If the average (arithmetic mean) of x + 2, x + 4, and x + 6 is 0   [#permalink] 11 Mar 2018, 11:09
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