this is the question on gmat official site.. can some1 help : Integrated Reasoning (IR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 24 Jan 2017, 15:44

### 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

# this is the question on gmat official site.. can some1 help

Author Message
Intern
Joined: 26 May 2012
Posts: 9
GMAT Date: 07-04-2012
Followers: 0

Kudos [?]: 5 [0], given: 8

this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

06 Jun 2012, 11:23
1
This post was
BOOKMARKED
Organization A currently has 1,050 members. Organization B currently has 1,550 members. The number of members of Organization A and the number of members of Organization B are increasing annually, each at its own constant rate. Analysts project that if each of these organizations maintains its constant annual rate of membership increase, five years from now they will for the first time have the same number of members, and in subsequent years Organization A will have more members than Organization B.

In the table below, identify a rate of increase, in members per year, for Organization A and a rate of increase, in members per year, for Organization B that together are consistent with the analysts’ projection. Make only one selection in each column.

Organization Organization B Rate of increase(members per year)

10

30

40

120

130

150
Intern
Joined: 26 May 2012
Posts: 9
GMAT Date: 07-04-2012
Followers: 0

Kudos [?]: 5 [0], given: 8

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

06 Jun 2012, 11:26
the question isnt shown properly.. these are the options... for both organization A as well as organisation B .. we have to find out rate for both from these options only
Manager
Status: Rising GMAT Star
Joined: 05 Jun 2012
Posts: 133
Location: Philippines
Concentration: General Management, Finance
GMAT 1: 660 Q V
GPA: 3.22
WE: Corporate Finance (Consulting)
Followers: 7

Kudos [?]: 52 [0], given: 16

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

06 Jun 2012, 20:55
Organization A currently has 1,050 members. Organization B currently has 1,550 members. The number of members of Organization A and the number of members of Organization B are increasing annually, each at its own constant rate. Analysts project that if each of these organizations maintains its constant annual rate of membership increase, five years from now they will for the first time have the same number of members, and in subsequent years Organization A will have more members than Organization B.

In the table below, identify a rate of increase, in members per year, for Organization A and a rate of increase, in members per year, for Organization B that together are consistent with the analysts’ projection. Make only one selection in each column.

Organization Organization B Rate of increase(members per year)

10

30

40

120

130

150

I don't quite get the IR.

But here's my take on the problem:

Let x be the number of people Org A adds in its work force per year
y be the number of people Org B adds in its work force per year

Now, problem states that after 5 years the two will have the same number of workforce.

1,050 + 5x = 1,550 + 5y
5x - 5y = 1,550 - 1,050
5 (x - y) = 500
x - y = 100

So what do we do about what?

I don't get it haha
_________________

Far better is it to dare mighty things, to win glorious triumphs, even though checkered by failure... than to rank with those poor spirits who neither enjoy nor suffer much, because they live in a gray twilight that knows not victory nor defeat.
- T. Roosevelt

Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 399
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Followers: 28

Kudos [?]: 1112 [0], given: 100

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

07 Jun 2012, 00:28
Let me try and see:

This is a linear growth problem (y=mx + c) and we know initial membership quantities:

Organization A: y = mx +1050
Organization B: y = nx + 1550

m and n are the respective growth rates for Organizations A and B.

At year 5, the membership qty becomes equal

mx+1050 = nx+1550 when x = 5

Thus: 5(m-n) = 1550 - 1050
m-n = 500/5
m-n = 100

Intuitively speaking. the growth rate for Org A is greater than B since after year five, it has more members.

Looking at the choices:
Org A : 130
Org B : 30

These values work because 130-30 = 100.

And where did you get this question from anyways?
Manager
Joined: 28 May 2011
Posts: 195
Location: United States
GMAT 1: 720 Q49 V38
GPA: 3.6
WE: Project Management (Computer Software)
Followers: 2

Kudos [?]: 60 [0], given: 7

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

19 Jun 2012, 07:59
macjas wrote:
Let me try and see:

This is a linear growth problem (y=mx + c) and we know initial membership quantities:

Organization A: y = mx +1050
Organization B: y = nx + 1550

However, tell me why do you think this is linear growth problem. What is given in question stem is "Number of members are increasing at constant rate" NOT "Number of members are increasing by constant number "
_________________

-------------------------------------------------------------------------------------------------------------------------------
http://gmatclub.com/forum/a-guide-to-the-official-guide-13-for-gmat-review-134210.html
-------------------------------------------------------------------------------------------------------------------------------

Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 399
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Followers: 28

Kudos [?]: 1112 [0], given: 100

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

19 Jun 2012, 08:05
anordinaryguy wrote:
macjas wrote:
Let me try and see:

This is a linear growth problem (y=mx + c) and we know initial membership quantities:

Organization A: y = mx +1050
Organization B: y = nx + 1550

However, tell me why do you think this is linear growth problem. What is given in question stem is "Number of members are increasing at constant rate" NOT "Number of members are increasing by constant number "

The fact the the question stem states constant rate indicates that its a linear growth problem. The other option is exponential growth but the question does not state this . Usually a constant rate IMO refers to linear growth unless specified otherwise. Hope this is somewhat helpful!
Manager
Joined: 28 May 2011
Posts: 195
Location: United States
GMAT 1: 720 Q49 V38
GPA: 3.6
WE: Project Management (Computer Software)
Followers: 2

Kudos [?]: 60 [0], given: 7

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

19 Jun 2012, 10:56
macjas wrote:
The fact the the question stem states constant rate indicates that its a linear growth problem. The other option is exponential growth but the question does not state this . Usually a constant rate IMO refers to linear growth unless specified otherwise. Hope this is somewhat helpful!

It definitely fits this question and I can not doubt MBA>com as well. However, by constant rate I always understood constant percentage.
For Ex.
Increase of 20 on 100 is 20% growth
and Increase of 24 on 120 is 20% growth.

So I can say, initial amount (100) grew at a constant rate(20%) for 2 periods, even though amount it grew by (20 Vs 24) was different during two periods.

_________________

-------------------------------------------------------------------------------------------------------------------------------
http://gmatclub.com/forum/a-guide-to-the-official-guide-13-for-gmat-review-134210.html
-------------------------------------------------------------------------------------------------------------------------------

Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 399
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Followers: 28

Kudos [?]: 1112 [0], given: 100

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

20 Jun 2012, 00:06
You make a good point. A percentage growth is an exponential growth pattern. Lets assume that we're dealing with exponential growth.

$$T_n = a*(r^{n})$$ general expression for exponential growth, where $$T_n$$ is the final quantity and n/m is the discrete time interval.

Then,
Org A: $$A_5=1050*r^{5}$$ where r is the growth rate for Org A
Org B: $$B_5=1550*s^{5}$$ where s is the growth rate for Org B

At time=5 (years) $$A_5=B_5$$
Then,
$$1050r^{5} = 1550s^{5}$$

$$\frac{1050}{1550} = \frac{s^{5}}{r^{5}}$$

Now testing this would take too much time (I didn't bother checking).
IMO, I doubt if you will see this kind of exponential growth problem in IR.
Senior Manager
Affiliations: UWC
Joined: 09 May 2012
Posts: 399
GMAT 1: 620 Q42 V33
GMAT 2: 680 Q44 V38
GPA: 3.43
WE: Engineering (Entertainment and Sports)
Followers: 28

Kudos [?]: 1112 [0], given: 100

Re: this is the question on gmat official site.. can some1 help [#permalink]

### Show Tags

20 Jun 2012, 00:47
I feel ,that if GMAC states 'factor' it implies exponential growth and if they state constant rate it means linear growth. Experts, please correct me if you think this is wrong. Take for example this OG12 question:

Attachment:

Capture.JPG [ 42.54 KiB | Viewed 3689 times ]

If you consider linear growth, the answer is 12.2
If you consider exponential growth, the answer is 12.

The OA is 12 so the question implies exponential growth
Re: this is the question on gmat official site.. can some1 help   [#permalink] 20 Jun 2012, 00:47
Similar topics Replies Last post
Similar
Topics:
2 IR access to official question bank 7 29 May 2013, 02:59
2 Help me to solve a question from IR in the Free Test (GMAT) 3 10 Mar 2013, 19:52
1 please help me in understanding how this question can be sol 4 17 Feb 2013, 02:17
Help needed-question from Gmat Pill 7 20 Jun 2012, 22:11
1 IR question from Princeton Review 2013.. can some1 help 4 07 Jun 2012, 21:52
Display posts from previous: Sort by