Last visit was: 26 Dec 2024, 23:47 It is currently 26 Dec 2024, 23:47
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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
Your Progress

every week, we’ll send you an estimated GRE 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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
PREVIOUS TOPIC
NEXT TOPIC

A zoo has twice as many zebras as lions and four times as ma

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
sandy
Retired Moderator
Joined: 07 Jun 2014
Posts: 4815
Own Kudos [?]: 11274 [5]
Given Kudos: 0
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Send PM
A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   19 Aug 2018, 03:20
Expert Reply
5
Bookmarks
00:00

Question Stats:

66% (01:02) correct 33% (01:30) wrong based on 81 sessions

Hide Show timer Statistics

A zoo has twice as many zebras as lions and four times as many monkeys as zebras. Which of the following could be the total number of zebras, lions, and monkeys at the zoo?

Indicate all such totals.

A. 14
B. 22
C. 28
D. 55
E. 121
ShowHide Answer
Official Answer
B,D,E
User avatar
P
GreenlightTestPrep
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12238 [0]
Given Kudos: 136
Send PM

Top Member of the Month
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   25 Aug 2018, 09:22
2
sandy wrote:
A zoo has twice as many zebras as lions and four times as many monkeys as zebras. Which of the following could be the total number of zebras, lions, and monkeys at the zoo?

Indicate all such totals.

A. 14
B. 22
C. 28
D. 55
E. 121


A zoo has twice as many zebras as lions
So, the ratio of zebras to lions = 2 : 1
Or we can write: Z : L = 2 : 1


There are four times as many monkeys as zebras
So, if Z = 2, then M = 8
In other words, M : Z : L = 8 : 2 : 1

So, one possible scenario is: 8 monkeys, 2 zebras and 1 lion (total = 11 animals)
Another possible scenario is: 16 monkeys, 4 zebras and 2 lions (total = 22 animals)
Another possible scenario is: 24 monkeys, 6 zebras and 3 lions (total = 33 animals)
Another possible scenario is: 32 monkeys, 8 zebras and 4 lions (total = 44 animals)
etc....

As we can see, the total number of animals must be a multiple of 11

Check the answer choices.....

B, D and E are multiples of 11

Answer: B, D, E

Cheers,
Brent
avatar
NickBass
Manager
Manager
Joined: 02 Mar 2020
Posts: 54
Own Kudos [?]: 14 [0]
Given Kudos: 0
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   25 Mar 2020, 14:48
GreenlightTestPrep wrote:
sandy wrote:
A zoo has twice as many zebras as lions and four times as many monkeys as zebras. Which of the following could be the total number of zebras, lions, and monkeys at the zoo?

Indicate all such totals.

A. 14
B. 22
C. 28
D. 55
E. 121


A zoo has twice as many zebras as lions
So, the ratio of zebras to lions = 2 : 1
Or we can write: Z : L = 2 : 1


There are four times as many monkeys as zebras
So, if Z = 2, then M = 8
In other words, M : Z : L = 8 : 2 : 1

So, one possible scenario is: 8 monkeys, 2 zebras and 1 lion (total = 11 animals)
Another possible scenario is: 16 monkeys, 4 zebras and 2 lions (total = 22 animals)
Another possible scenario is: 24 monkeys, 6 zebras and 3 lions (total = 33 animals)
Another possible scenario is: 32 monkeys, 8 zebras and 4 lions (total = 44 animals)
etc....

As we can see, the total number of animals must be a multiple of 11

Check the answer choices.....

B, D and E are multiples of 11

Answer: B, D, E

Cheers,
Brent



I read in a GMAT book that "There are four times as many monkeys as zebras" would mean Monkeys/4 = the number of zebras. So 4z=M.

Can you explain why that isn't the case here? I got the right answer, so I'm up to speed on the concept, but had to work through this clutter.
avatar
510784zc
Intern
Intern
Joined: 27 Jun 2020
Posts: 7
Own Kudos [?]: 12 [0]
Given Kudos: 0
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   17 Jul 2020, 03:35
1
NickBass wrote:
GreenlightTestPrep wrote:
sandy wrote:
A zoo has twice as many zebras as lions and four times as many monkeys as zebras. Which of the following could be the total number of zebras, lions, and monkeys at the zoo?

Indicate all such totals.

A. 14
B. 22
C. 28
D. 55
E. 121


A zoo has twice as many zebras as lions
So, the ratio of zebras to lions = 2 : 1
Or we can write: Z : L = 2 : 1


There are four times as many monkeys as zebras
So, if Z = 2, then M = 8
In other words, M : Z : L = 8 : 2 : 1

So, one possible scenario is: 8 monkeys, 2 zebras and 1 lion (total = 11 animals)
Another possible scenario is: 16 monkeys, 4 zebras and 2 lions (total = 22 animals)
Another possible scenario is: 24 monkeys, 6 zebras and 3 lions (total = 33 animals)
Another possible scenario is: 32 monkeys, 8 zebras and 4 lions (total = 44 animals)
etc....

As we can see, the total number of animals must be a multiple of 11

Check the answer choices.....

B, D and E are multiples of 11

Answer: B, D, E

Cheers,
Brent



I read in a GMAT book that "There are four times as many monkeys as zebras" would mean Monkeys/4 = the number of zebras. So 4z=M.

Can you explain why that isn't the case here? I got the right answer, so I'm up to speed on the concept, but had to work through this clutter.


It does actually apply here as well. It is true that 4Z=M. We also know that Z=2L. Then substituting this into the former: 4(2L)=M --> 8L=M.
To work it out further in this manner: we know that Z=2L and there are L lions. So we add them all up:
8L + 2L + L = 11L
Therefore, the total number of animals should be a multiple of 11.
avatar
B
mind
Manager
Manager
Joined: 09 Jan 2020
Posts: 112
Own Kudos [?]: 274 [0]
Given Kudos: 97
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   13 May 2021, 22:11
Why is the wording of this question so confusing to me?

twice as many zebras as lions: 2z = l
then, I thought
four times as many moneys as zebras: 4m = z

BUT, as many pointed out here that 4m = z is clearly wrong. Why the language is the same but 4m = z is not correct? The wording must have tricked me somehow. Can someone help?
User avatar
D
rx10
Retired Moderator
Joined: 02 Dec 2020
Posts: 1831
Own Kudos [?]: 2149 [3]
Given Kudos: 140
GRE 1: Q168 V157

GRE 2: Q167 V161
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   14 May 2021, 01:15
2
1
Bookmarks
Twice as many zebras as lions so \(z : l = 2 : 1\)

Four times as many moneys as zebras = \(m : z = 4 : 1\) --- \(m = 4z\)

The nos are in proportion here. Twice as many zebras as lions means that for every lion there are two zebras.

So \(m : z : l = 8 : 2 : 1\)

Hence the answer will be multiple of \(11\).

mind wrote:
Why is the wording of this question so confusing to me?

twice as many zebras as lions: 2z = l
then, I thought
four times as many moneys as zebras: 4m = z

BUT, as many pointed out here that 4m = z is clearly wrong. Why the language is the same but 4m = z is not correct? The wording must have tricked me somehow. Can someone help?
avatar
B
lucifer6251
Intern
Intern
Joined: 01 Sep 2021
Posts: 36
Own Kudos [?]: 34 [0]
Given Kudos: 77
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   09 Sep 2021, 21:08
z = 2L
=> L = z/2

m = 4z

total:
z + L + m
= z + z/2 + 4z
= 11z/2
= 11/2 * z

To make the total count an integer, the least value of z = 2

So, the total could be 11 or multiples of 11.

Ans: B, D, E
User avatar
bumpbot
GRE Prep Club Legend
GRE Prep Club Legend
Joined: 07 Jan 2021
Posts: 5091
Own Kudos [?]: 76 [0]
Given Kudos: 0
Send PM
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink] New post   12 Sep 2022, 11:05
Hello from the GRE Prep Club BumpBot!

Thanks to another GRE Prep 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.
Prep Club for GRE Bot
gmatclubot
Re: A zoo has twice as many zebras as lions and four times as ma [#permalink]
12 Sep 2022, 11:05
Moderators:
adewale223
GRE Instructor
88 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1115 posts
VibhuAnurag
GRE Instructor
234 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact