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What is the value of |m - n|? (1) n^2 = 36 (2) m^2 = 81

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Joined: 02 Sep 2009
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What is the value of |m - n|? (1) n^2 = 36 (2) m^2 = 81  [#permalink]

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New post 28 Mar 2018, 23:51
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

90% (00:31) correct 10% (00:18) wrong based on 67 sessions

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Re: What is the value of |m - n|? (1) n^2 = 36 (2) m^2 = 81  [#permalink]

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New post 29 Mar 2018, 01:37
Bunuel wrote:

GMAT CLUB TESTS' FRESH QUESTION.



What is the value of |m - n|?

(1) n^2 = 36
(2) m^2 = 81


(1) n^2 = 36 ... Hence n = +6 or -6. Since we do not know what m is Insuff

(2) We do not know what n is. Insuff

(1) + (2) ... n = +6 or - 6.... m = +9 or -9

m-n = +15,-15,3,-3

|m-n| = 15 or 3

So (1) + (2) is Insuff

Hence Option (E) is our answer.

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Gladi
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Re: What is the value of |m - n|? (1) n^2 = 36 (2) m^2 = 81  [#permalink]

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New post 30 Mar 2018, 11:27
Bunuel wrote:

GMAT CLUB TESTS' FRESH QUESTION.



What is the value of |m - n|?

(1) n^2 = 36
(2) m^2 = 81


(1) n^2 = 36

n = 6 or -6

No info about m

Insufficient

(2) m^2 = 81

m = 9 or -9

No info about m

Insufficient

Combine both 1 & 2

Let n =6 & m = 9....|m - n| = |9 - 6| = 3

Let n =6 & m = -9....|m - n| = |-9 - 6| = 15

Two different answers

Insufficient

Answer: E
Re: What is the value of |m - n|? (1) n^2 = 36 (2) m^2 = 81 &nbs [#permalink] 30 Mar 2018, 11:27
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