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# What is the average (arithmetic mean) of a, b, c and d?

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Math Expert
Joined: 02 Sep 2009
Posts: 56244
What is the average (arithmetic mean) of a, b, c and d?  [#permalink]

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23 Jul 2018, 02:56
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Difficulty:

25% (medium)

Question Stats:

78% (01:07) correct 22% (01:00) wrong based on 42 sessions

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What is the average (arithmetic mean) of a, b, c and d?

(1) The average of a, b and c is 6

(2) The average of b, c and d is 6

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Math Expert
Joined: 02 Aug 2009
Posts: 7764
Re: What is the average (arithmetic mean) of a, b, c and d?  [#permalink]

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23 Jul 2018, 03:43
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1
What is the average (arithmetic mean) of a, b, c and d?

(1) The average of a, b and c is 6..
Insufficient

(2) The average of b, c and d is 6
Insufficient

Combined..
We can say average of a,b,c,b,c,d is 6...
So a,2b,2c,d average is 6 but unless we know about B and C we cannot answer..
Say b and c are 6 each, so all values are 6 each and average of a,b,c,d is 6
Say b is 8, c is 7 so a=d=3...
Average of a,b,c and d is (8+7+3+3)/4=21/4
Insufficient

E
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Re: What is the average (arithmetic mean) of a, b, c and d?   [#permalink] 23 Jul 2018, 03:43
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