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

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Math Expert
Joined: 02 Sep 2009
Posts: 52168
Is the average (arithmetic mean) of a and b greater than 30?  [#permalink]

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28 Dec 2017, 20:39
00:00

Difficulty:

15% (low)

Question Stats:

82% (00:34) correct 18% (00:41) wrong based on 57 sessions

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

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

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examPAL Representative
Joined: 07 Dec 2017
Posts: 867
Is the average (arithmetic mean) of a and b greater than 30?  [#permalink]

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29 Dec 2017, 03:50
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!
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Is the average (arithmetic mean) of a and b greater than 30? &nbs [#permalink] 29 Dec 2017, 03:50
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