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Is the average (arithmetic mean) of a and b greater than 30?

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Math Expert
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Joined: 02 Sep 2009
Posts: 49968
Is the average (arithmetic mean) of a and b greater than 30?  [#permalink]

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New post 28 Dec 2017, 21:39
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (00:35) correct 15% (00:48) wrong based on 51 sessions

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Is the average (arithmetic mean) of a and b greater than 30?  [#permalink]

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New post 29 Dec 2017, 04:50
1
Bunuel wrote:
Is the average (arithmetic mean) of a and b greater than 30?

(1) a is a positive number.
(2) b is greater than 60.


To find the average of two numbers we need to know their sum.
We'll see whether the statements give us this information - a Logical approach.

(1) does not give us the sum of a and b.
Insufficient.

(2) does not give us the sum of a and b (as a could be negative).
Insufficient.

Combined: Now we know that the sum of a and b must be greater than 60 so their average must be greater than 30.
Enough information!
(C) is our answer.
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Is the average (arithmetic mean) of a and b greater than 30? &nbs [#permalink] 29 Dec 2017, 04:50
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Is the average (arithmetic mean) of a and b greater than 30?

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