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If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?

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If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?  [#permalink]

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New post 26 Nov 2019, 01:25
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Question Stats:

70% (01:11) correct 30% (00:59) wrong based on 27 sessions

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If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?

A. 4
B. 6
C. 8
D. 10
E. 12
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Re: If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?  [#permalink]

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New post 26 Nov 2019, 01:42
We want to find the solution for \(\frac{(a+b+c)}{3}\)

Lets just add given equations

a+b=7
b+c=14
a+c=3

a+b+b+c+a+c=24
2(a+b+c)=24
a+b+c=12

12/3=4

IMO
Ans: A
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Re: If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?  [#permalink]

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New post 26 Nov 2019, 01:55
Bunuel wrote:
If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?

A. 4
B. 6
C. 8
D. 10
E. 12


solve
given eqn
we get a= -2, b=9 and c= 5
avg = 4
IMO A
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Re: If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?   [#permalink] 26 Nov 2019, 01:55
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If a+b=7, b+c=14, and a+c=3, what is the average of a, b, and c?

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