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

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

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New post 23 Jul 2018, 02:56
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

73% (01:02) correct 27% (01:08) wrong based on 30 sessions

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Posts: 6531
Re: What is the average (arithmetic mean) of a, b, c and d?  [#permalink]

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

(1) The average of a, b and c is 6..
Nothing known about d
Insufficient

(2) The average of b, c and d is 6
Nothing about a
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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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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