GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

 It is currently 18 Feb 2020, 22:17

### 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

# If the average (arithmetic mean) of a and b is 6, and a2 – b2 = 2, wha

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 61283
If the average (arithmetic mean) of a and b is 6, and a2 – b2 = 2, wha  [#permalink]

### Show Tags

27 Feb 2019, 22:47
00:00

Difficulty:

15% (low)

Question Stats:

92% (01:01) correct 8% (01:31) wrong based on 25 sessions

### HideShow timer Statistics

If the average (arithmetic mean) of a and b is 6, and a^2 – b^2 = 2, what is the value of a – b ?

A. 1/6
B. 1/3
C. 1/2
D. 2
E. 3

_________________
Manager
Joined: 31 Dec 2018
Posts: 114
Location: India
Re: If the average (arithmetic mean) of a and b is 6, and a2 – b2 = 2, wha  [#permalink]

### Show Tags

27 Feb 2019, 23:09
a+b=12
(a+b)(a-b)=2
a-b=2/12=1/6

Posted from my mobile device
GMAT Club Legend
Joined: 18 Aug 2017
Posts: 5931
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: If the average (arithmetic mean) of a and b is 6, and a2 – b2 = 2, wha  [#permalink]

### Show Tags

28 Feb 2019, 05:00
Bunuel wrote:
If the average (arithmetic mean) of a and b is 6, and a^2 – b^2 = 2, what is the value of a – b ?

A. 1/6
B. 1/3
C. 1/2
D. 2
E. 3

a+b=12
and (a+b)*(a-b)=2
a-b=1/6
IMO A
Re: If the average (arithmetic mean) of a and b is 6, and a2 – b2 = 2, wha   [#permalink] 28 Feb 2019, 05:00
Display posts from previous: Sort by