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What is the average (arithmetic mean) of a, b, and c? (1) (a

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What is the average (arithmetic mean) of a, b, and c? (1) (a  [#permalink]

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New post 18 Nov 2018, 10:18
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

97% (00:31) correct 3% (00:19) wrong based on 92 sessions

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

(1) (a + b) + (c + d) = 17

(2) d = 5

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Re: What is the average (arithmetic mean) of a, b, and c? (1) (a  [#permalink]

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New post 03 Jan 2019, 15:13
1
IMO C.

Average = sum of observations/ number of observations

So a+b+c = 17-d as per Statement 1.
Question arises what is D? So ! alone is insufficient, ruling out A and D.

Statement 2
d=5, on its own it is insufficient. D is not defined by question stem. B is not possible.

So (1)+(2) a+b+c = 17-5 = 12, that works
average = 12/3 =4 as per formula defined above.

C is the correct answer, hence proved.
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Re: What is the average (arithmetic mean) of a, b, and c? (1) (a   [#permalink] 03 Jan 2019, 15:13
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