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# If the sum of 3, 7, and x is 18, then the average (arithmet

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If the sum of 3, 7, and x is 18, then the average (arithmet [#permalink]  11 Jun 2019, 02:37
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Question Stats:

80% (00:15) correct 20% (00:52) wrong based on 15 sessions
If the sum of 3, 7, and x is 18, then the average (arithmetic mean) of 3, 7, and x is

(A) 6

(B) 7

(C) 8

(D) 9

(E) 10
[Reveal] Spoiler: OA

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Re: If the sum of 3, 7, and x is 18, then the average (arithmet [#permalink]  11 Jun 2019, 08:11
Expert's post
Carcass wrote:
If the sum of 3, 7, and x is 18, then the average (arithmetic mean) of 3, 7, and x is

(A) 6

(B) 7

(C) 8

(D) 9

(E) 10

Average $$= \frac{3+7+x}{3}$$

Since we're told that the sum of 3, 7, and x is 18, we can replace the numerator with 18 to get:

Average $$= \frac{18}{3}=6$$

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Re: If the sum of 3, 7, and x is 18, then the average (arithmet   [#permalink] 11 Jun 2019, 08:11
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