GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 07 Dec 2019, 06:36 ### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  # For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,

Author Message
TAGS:

### Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 59589
For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags 00:00

Difficulty:   25% (medium)

Question Stats: 72% (00:54) correct 28% (00:59) wrong based on 81 sessions

### HideShow timer Statistics

For all numbers m and n, m?n = (2m – n)(m + n). If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. −7
E. −14

_________________
GMAT Club Legend  V
Joined: 18 Aug 2017
Posts: 5436
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

1
Bunuel wrote:
For all numbers m and n, m N = (2m – n)(m + n). If m = 3 and n = 4, then n m =

A. 35
B. 14
C. 7
D. −7
E. −14

any specific reason n is highlighted blue and is in capital Bunuel ... is answer 14?
Math Expert V
Joined: 02 Sep 2009
Posts: 59589
Re: For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

Archit3110 wrote:
Bunuel wrote:
For all numbers m and n, m N = (2m – n)(m + n). If m = 3 and n = 4, then n m =

A. 35
B. 14
C. 7
D. −7
E. −14

any specific reason n is highlighted blue and is in capital Bunuel ... is answer 14?

_________________
Edited. Thank you.
_________________
GMAT Club Legend  V
Joined: 18 Aug 2017
Posts: 5436
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

Bunuel wrote:
For all numbers m and n, m?n = (2m – n)(m + n). If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. −7
E. −14

m?n= (2m – n)(m + n)

n?m= (2n-m)(m+n)
= (2*4-3)(4+3)
=35 option A.

Originally posted by Archit3110 on 15 Nov 2018, 04:22.
Last edited by Archit3110 on 15 Nov 2018, 05:04, edited 1 time in total.
Director  G
Joined: 19 Oct 2013
Posts: 511
Location: Kuwait
GPA: 3.2
WE: Engineering (Real Estate)
Re: For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

Bunuel wrote:
For all numbers m and n, m?n = (2m – n)(m + n). If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. −7
E. −14

It becomes (2n - m)(n + m)

(2*4 - 3) (4 + 3) = (8 - 3) (7) = 5 * 7 = 35

Answrr choice A

Posted from my mobile device
e-GMAT Representative V
Joined: 04 Jan 2015
Posts: 3158
For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

Solution

Given:
• m?n = (2m – n)(m + n)
• m = 3 and n = 4

To find:
• The value of n?m

Approach and Working:
• 4?3 = (2 * 4 – 3)(4 + 3) = 5 * 7 =35

Hence, the correct answer is Option A

_________________
GMAT Club Legend  V
Joined: 12 Sep 2015
Posts: 4125
Re: For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,  [#permalink]

### Show Tags

Top Contributor
Bunuel wrote:
For all numbers m and n, m?n = (2m – n)(m + n). If m = 3 and n = 4, then n?m =

A. 35
B. 14
C. 7
D. −7
E. −14

GOAL: Find the value of 4?3

GIVEN: m?n = (2m - n)(m+ n)
So, 4?3 = (2(4) - 3)(4+ 3)
= (5)(7)
= 35

Cheers,
Brent
_________________ Re: For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,   [#permalink] 06 Apr 2019, 07:56
Display posts from previous: Sort by

# For all numbers m and n, m @ n = (2m – n)(m + n). If m = 3 and n = 4,   