Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Mar 2015, 18:04

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# What is the mean of four consecutive even integers a , b , c

Author Message
TAGS:
Director
Joined: 01 Apr 2008
Posts: 906
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 298 [0], given: 18

What is the mean of four consecutive even integers a , b , c [#permalink]  25 Oct 2009, 10:53
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
What is the mean of four consecutive even integers a , b , c , d ?

1. a + d = b + c
2. b + c = d - a
Director
Joined: 27 Jun 2008
Posts: 547
WE 1: Investment Banking - 6yrs
Followers: 1

Kudos [?]: 48 [0], given: 92

Re: even consecutive [#permalink]  25 Oct 2009, 10:56
Is there something missing in the Q? I didn't understand the Q
Director
Joined: 01 Apr 2008
Posts: 906
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 298 [0], given: 18

Re: even consecutive [#permalink]  25 Oct 2009, 11:13
Nopes, question is correct
Manager
Status: Berkeley Haas 2013
Joined: 23 Jul 2009
Posts: 192
Followers: 1

Kudos [?]: 32 [0], given: 16

Re: even consecutive [#permalink]  25 Oct 2009, 18:36
Is C the OA?

Since they are 4 even consecutive integers , b, c, d can be represented as a+2, a+4, a+6 resp

So mean is a+a+2+a+4+a+6 divided by 4 => a+3 ------> eqn 1

Now 1)

a+d = b+c

which means Mean = a+b+c+d divided by 4 => b+c divided by 2

We know nothing about a or any number. So insuff

Now from 2)

b+c = d-a

We get Mean = d/2 which yields nothing - so insuff

Together

a+d = b+c and
b+c = d-a

equating the two above we get

a+d = d-a or
2a = 0
a =0

Hence we get a

From eqn ---->1 we know Mean = a+3

Hence Mean = 0+3 = 3

Sufficient by both 1 and 2

Correct me if I am wrong. Would appreciate it
Senior Manager
Affiliations: PMP
Joined: 13 Oct 2009
Posts: 312
Followers: 3

Kudos [?]: 110 [0], given: 37

Re: even consecutive [#permalink]  25 Oct 2009, 18:47
IMO B

What is the mean of four consecutive even integers a , b , c , d ?

1. a + d = b + c
2. b + c = d - a

lets assume the numbers as a, a+2, a+4, a+6 since they are four consecutive integers

S1 ) given that a+d = b+c

2a +6 = 2a + 6 - no new information is given that is different from question stem - insufficient

S2) given that b+c = d-a

==>

a+2+a+4 = a+6-a

2a+6 =6 ==> a = 0, so the numbers are 0, 2,4,6 and we can calculate mean - sufficient.Hence

_________________

Thanks, Sri
-------------------------------
keep uppp...ing the tempo...

Press +1 Kudos, if you think my post gave u a tiny tip

Manager
Status: Berkeley Haas 2013
Joined: 23 Jul 2009
Posts: 192
Followers: 1

Kudos [?]: 32 [0], given: 16

Re: even consecutive [#permalink]  25 Oct 2009, 18:52
srini123 wrote:
IMO B

What is the mean of four consecutive even integers a , b , c , d ?

1. a + d = b + c
2. b + c = d - a

lets assume the numbers as a, a+2, a+4, a+6 since they are four consecutive integers

S1 ) given that a+d = b+c

2a +6 = 2a + 6 - no new information is given that is different from question stem - insufficient

S2) given that b+c = d-a

==>

a+2+a+4 = a+6-a

2a+6 =6 ==> a = 0, so the numbers are 0, 2,4,6 and we can calculate mean - sufficient.Hence

Yeah I think this is the answer. I did not think about it though. Nice catch Sri
Director
Joined: 01 Apr 2008
Posts: 906
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 18

Kudos [?]: 298 [0], given: 18

Re: even consecutive [#permalink]  26 Oct 2009, 01:33
Question: The stem does not specify the order of elements. it can d<a<b<c or a<b<c<d...does the solution hold true in both the cases? I am lazy to calculate today
Intern
Joined: 11 Jul 2009
Posts: 22
Followers: 0

Kudos [?]: 1 [0], given: 0

Re: even consecutive [#permalink]  26 Oct 2009, 08:23
Order not known..imo c..
Senior Manager
Affiliations: PMP
Joined: 13 Oct 2009
Posts: 312
Followers: 3

Kudos [?]: 110 [0], given: 37

Re: even consecutive [#permalink]  26 Oct 2009, 09:48
What is the mean of four consecutive even integers a , b , c , d ?

1. a + d = b + c
2. b + c = d - a

If we don't know the order of ab,c,d i think the answer would be E

from S1 and S2 all we know is a=0

if the order was d,c,b,a then numbers are -6,-4,-2,0 and mean is -4
if the order was a,b,c,d then numbers are 0,2,4,6 and mean is 4

still both together are not sufficient. hence E

is this right ?

what is OA ?
_________________

Thanks, Sri
-------------------------------
keep uppp...ing the tempo...

Press +1 Kudos, if you think my post gave u a tiny tip

Re: even consecutive   [#permalink] 26 Oct 2009, 09:48
Similar topics Replies Last post
Similar
Topics:
What is the mean of four consecutive even integers a ,b ,c 9 05 Jan 2010, 04:13
1 What is the mean of four consecutive even integers a , b , c 1 24 Sep 2009, 07:43
What is the mean of four consecutive even integers a , b , c 3 03 Sep 2009, 15:35
1 If a, b, and c are consecutive positive even integers and a 9 06 Feb 2008, 07:40
Display posts from previous: Sort by