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

 It is currently 08 Feb 2016, 15:45

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

In a zoo, the ratio of the number of cheetahs to the number

Author Message
TAGS:
Manager
Joined: 15 Apr 2012
Posts: 93
Concentration: Technology, Entrepreneurship
GMAT 1: 460 Q38 V17
GMAT 2: Q V
GPA: 3.56
Followers: 0

Kudos [?]: 25 [0], given: 134

In a zoo, the ratio of the number of cheetahs to the number [#permalink]  07 Jul 2012, 21:52
1
This post was
BOOKMARKED
00:00

Difficulty:

5% (low)

Question Stats:

89% (01:51) correct 11% (01:05) wrong based on 81 sessions
In a zoo, the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same five years ago. If the increase in the number of cheetahs in the zoo since then is 5, then what is the increase in the number of pandas?

(A) 2
(B) 3
(C) 5
(D) 10
(E) 15
[Reveal] Spoiler: OA

Last edited by Bunuel on 08 Jul 2012, 01:45, edited 1 time in total.
Edited the question.
Intern
Joined: 15 Jun 2010
Posts: 1
Followers: 0

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

Re: In a zoo [#permalink]  07 Jul 2012, 23:15
1
KUDOS
One short cut to solve the problem is

c:p = 1:3
c increased to 6
=> 1:3 = 6:x
=> x = 18
=>p increased by 15
Senior Manager
Joined: 28 Mar 2012
Posts: 287
Concentration: Entrepreneurship
GMAT 1: 640 Q50 V26
GMAT 2: 660 Q50 V28
GMAT 3: 730 Q50 V38
Followers: 23

Kudos [?]: 288 [0], given: 23

Re: In a zoo [#permalink]  08 Jul 2012, 01:24
farukqmul wrote:
In a zoo, the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same five
years ago. If the increase in the number of cheetahs in the zoo since then is 5, then what is the
increase in the number of pandas?
A) 2
(B) 3
(C) 5
(D) 10
(E) 15

Hi,

Ratio of cheetah to panda = 1:3
or $$\frac {x}{3x}$$
so, if number of cheetah increases by 5 such that the ratio must remain same, then
$$\frac {x+5x}{3(x+5x)} = \frac {x+5x}{3x+15x}$$
so increase in the number of panda would be in multiple of 15.

Regards,
Senior Manager
Status: Prevent and prepare. Not repent and repair!!
Joined: 13 Feb 2010
Posts: 275
Location: India
Concentration: Technology, General Management
GPA: 3.75
WE: Sales (Telecommunications)
Followers: 9

Kudos [?]: 57 [0], given: 282

Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink]  27 Jul 2012, 03:02
Consider the number of cheetahs = 10;...> no of pandas=30
Therefore if number of cheetas is 5 more=10+5=15 then pandas must be 3 times more=15*3=45.
Increase in the number of pandas=45-30=15

Ans-D
_________________

I've failed over and over and over again in my life and that is why I succeed--Michael Jordan
Kudos drives a person to better himself every single time. So Pls give it generously
Wont give up till i hit a 700+

GMAT Club Legend
Joined: 09 Sep 2013
Posts: 8177
Followers: 416

Kudos [?]: 111 [0], given: 0

Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink]  04 Mar 2015, 10:21
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
EMPOWERgmat Instructor
Status: GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 5571
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: 340 Q170 V170
Followers: 224

Kudos [?]: 1582 [0], given: 152

Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink]  04 Mar 2015, 16:43
Expert's post
Hi All,

When a ratio question involves "relatively small" numbers, you can quickly "brute force" the prompt and get to the correct answer.

Here, we know the ratio of cheetahs to pandas is 1:3. Since you can't have a "fraction" of an animal, that means that the number of cheetahs is a multiple of 1 and the number of pandas is the equivalent multiple of 3.

Here is a quick list of the immediate possibilities....

C:P
1:3
1 and 3
2 and 6
3 and 9
4 and 12
5 and 15
6 and 18
Etc.

We're told that the ratio of cheetahs to pandas stayed the same and that over the last 5 years there was an increase of 5 cheetahs.

If we "start" with 1 cheetah and 3 pandas, then increase the number of cheetahs by 5.....we'll have 6 cheetahs and 18 pandas....Thus, the number of pandas increased from 3 to 18 (an increase of 15.

[Reveal] Spoiler:
E

GMAT assassins aren't born, they're made,
Rich
_________________

Rich Cohen

Co-Founder & GMAT Assassin

Special Offer: Save $75 + GMAT Club Tests 60-point improvement guarantee www.empowergmat.com/ Veritas Prep GMAT Instructor Joined: 16 Oct 2010 Posts: 6219 Location: Pune, India Followers: 1676 Kudos [?]: 9599 [0], given: 197 Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink] 04 Mar 2015, 21:12 Expert's post farukqmul wrote: In a zoo, the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same five years ago. If the increase in the number of cheetahs in the zoo since then is 5, then what is the increase in the number of pandas? (A) 2 (B) 3 (C) 5 (D) 10 (E) 15 Use simple logic: Given the ratio 1:3, if you increase 1 by 5, you will need to increase 3 by 3*5 to retain the ratio $$\frac{1}{3} = \frac{1 + x}{3 + 3x} = \frac{1(1+x)}{3(1+x)} = \frac{1}{3}$$ So, if you increase numerator by 5, denominator must be increased by 3*5 = 15 _________________ Karishma Veritas Prep | GMAT Instructor My Blog Get started with Veritas Prep GMAT On Demand for$199

Veritas Prep Reviews

Manager
Joined: 12 Oct 2014
Posts: 66
Location: India
Concentration: Finance, General Management
GMAT 1: 550 Q44 V21
WE: Analyst (Investment Banking)
Followers: 0

Kudos [?]: 8 [0], given: 241

Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink]  05 Mar 2015, 07:03
One simple logic would be;If two things are in ratio then over the period of time if there is any increment/decrement and even after that they maintain same ratio then increment/decrement will also be in the same ratio.

Now and 5 years back ratio is= 1:3
Increment in C= 5
Hence, Increment in P will be 15

Hope this helps !
Re: In a zoo, the ratio of the number of cheetahs to the number   [#permalink] 05 Mar 2015, 07:03
Similar topics Replies Last post
Similar
Topics:
2 The ratio of the number of boys to the number of girls in a certain 2 03 Apr 2015, 13:01
9 At a certain university, the ratio of the number of teaching 7 24 Oct 2010, 16:57
number properties/ratio 5 07 Mar 2010, 15:29
27 At a Certain school, the ratio of the number of second 17 16 Jul 2009, 10:59
17 At a certain university, the ratio of the number of teaching 16 04 Jun 2009, 20:11
Display posts from previous: Sort by