It is currently 22 Feb 2018, 09:12

TODAY:

MIT Sloan Releasing 1st Wave of Interview Invites - Join GMATClub CHAT for Live Updates


Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

A certain language school has two classes for children.

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

2 KUDOS received
Senior Manager
Senior Manager
avatar
P
Joined: 06 Jan 2015
Posts: 321
Location: India
Concentration: Operations, Finance
GPA: 3.35
WE: Information Technology (Computer Software)
A certain language school has two classes for children. [#permalink]

Show Tags

New post 26 Jul 2016, 21:33
2
This post received
KUDOS
2
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

82% (00:46) correct 18% (00:54) wrong based on 125 sessions

HideShow timer Statistics

A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?
(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.
(2) In each class, the average (arithmetic mean) age of the children is 10 years.
[Reveal] Spoiler: OA

_________________

आत्मनॊ मोक्षार्थम् जगद्धिताय च

Resource: GMATPrep RCs With Solution

Board of Directors
User avatar
V
Status: Aiming MBA
Joined: 18 Jul 2015
Posts: 3076
Location: India
Concentration: Healthcare, Technology
GPA: 3.65
WE: Information Technology (Health Care)
Premium Member Reviews Badge
Re: A certain language school has two classes for children. [#permalink]

Show Tags

New post 26 Jul 2016, 23:51
NandishSS wrote:
A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?
(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.
(2) In each class, the average (arithmetic mean) age of the children is 10 years.


Statement 1 : Number of children and the age of the youngest child do not provide us any information on the age of the eldest child of any of the class. INSUFFICIENT.

Statement 2 : Average Age doesn't tell us anything about the age of youngest and eldest child.--- INSUFFICIENT.

Combining 1 and 2 , We know that the sum of the ages in the two classes if 180(18*10), but still we are not sure if ages have any pattern or not.

Thus, Answer is E.
_________________

How I improved from V21 to V40! ?


How to use this forum in THE BEST way?

Intern
Intern
avatar
B
Joined: 16 Aug 2015
Posts: 16
Re: A certain language school has two classes for children. [#permalink]

Show Tags

New post 28 Jun 2017, 20:00
abhimahna wrote:
NandishSS wrote:
A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?
(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.
(2) In each class, the average (arithmetic mean) age of the children is 10 years.


Statement 1 : Number of children and the age of the youngest child do not provide us any information on the age of the eldest child of any of the class. INSUFFICIENT.

Statement 2 : Average Age doesn't tell us anything about the age of youngest and eldest child.--- INSUFFICIENT.

Combining 1 and 2 , We know that the sum of the ages in the two classes if 180(18*10), but still we are not sure if ages have any pattern or not.

Thus, Answer is E.


Could someone explain why statements 1+2 is still insufficient?

Given info:
Youngest child in each class = 8
Average = 10
number of children = 18
sum = 180

Since we know the youngest age, and the average, the oldest age would just be equidistant from that average, no?
1 KUDOS received
Intern
Intern
avatar
S
Joined: 11 Aug 2016
Posts: 47
Location: India
Concentration: Operations, General Management
Schools: HBS '18, ISB '17, IIMA
GMAT 1: 710 Q49 V38
GPA: 3.95
WE: Design (Manufacturing)
GMAT ToolKit User
Re: A certain language school has two classes for children. [#permalink]

Show Tags

New post 29 Jun 2017, 08:27
1
This post received
KUDOS
1
This post was
BOOKMARKED
iyera211 wrote:
abhimahna wrote:
NandishSS wrote:
A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?
(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.
(2) In each class, the average (arithmetic mean) age of the children is 10 years.


Statement 1 : Number of children and the age of the youngest child do not provide us any information on the age of the eldest child of any of the class. INSUFFICIENT.

Statement 2 : Average Age doesn't tell us anything about the age of youngest and eldest child.--- INSUFFICIENT.

Combining 1 and 2 , We know that the sum of the ages in the two classes if 180(18*10), but still we are not sure if ages have any pattern or not.

Thus, Answer is E.


Could someone explain why statements 1+2 is still insufficient?

Given info:
Youngest child in each class = 8
Average = 10
number of children = 18
sum = 180

Since we know the youngest age, and the average, the oldest age would just be equidistant from that average, no?


No, it is not necessary that the eldest child will have an age that is equidistant from the average.

Let us take 2 examples.

1) We know that the sum of the ages of all students is 180 and of youngest child is 8
Let us assume that all the children except the youngest and eldest children are of age 9
Then,
Y+9*16+E=180 (Y denotes the age of the youngest and E denotes the age of the eldest)
8+144+E=180
E=180-144-8=28

2) Now let us assume that all the children except the youngest and eldest children are of age 10
Y+10*16+E=180
8+160+E=180
E=12

So we see that it depends on the age of the remaining 16 students what the age of the eldest would be
Since we cannot determine the age of the eldest child, we cannot determine the range even by using both the statements

Answer E

Hope it is clear.
Verbal Forum Moderator
User avatar
P
Joined: 19 Mar 2014
Posts: 992
Location: India
Concentration: Finance, Entrepreneurship
GPA: 3.5
GMAT ToolKit User Premium Member
Re: A certain language school has two classes for children. [#permalink]

Show Tags

New post 29 Jun 2017, 13:30
A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?

(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.

From this we know the number of children and the lowest age in the class, this still does not help us to determine the range of the ages.

Hence, (1) =====> is NOT SUFFICIENT

(2) In each class, the average (arithmetic mean) age of the children is 10 years.

With this we know the average age of 10 years however, this still does not give us the range of ages which we are looking for.

Hence, (2) =====> is NOT SUFFICIENT

Combining (1) & (2)

We know total children = 18 and Average Age = 10 - with this we can calculate the total age of the students = 180 years.

However, we will still not be able to determine the range of the ages with the given infiormation, even after considering the lowest age is 8 years information.

Hence, combined (1) & (2) =====> is NOT SUFFICIENT

Hence, Answer is E
_________________

"Nothing in this world can take the place of persistence. Talent will not: nothing is more common than unsuccessful men with talent. Genius will not; unrewarded genius is almost a proverb. Education will not: the world is full of educated derelicts. Persistence and determination alone are omnipotent."

Best AWA Template: https://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html#p470475

Director
Director
avatar
S
Joined: 12 Nov 2016
Posts: 790
Re: A certain language school has two classes for children. [#permalink]

Show Tags

New post 10 Sep 2017, 21:06
NandishSS wrote:
A certain language school has two classes for children. Is the range of ages, in years, of the children in the first class equal to the range of ages, in years, of the children in the second class?
(1) In each class, the number of children is 18 and the age of the youngest child is 8 years.
(2) In each class, the average (arithmetic mean) age of the children is 10 years.


This is essentially the same question as - https://gmatclub.com/forum/hospital-h-c ... 20594.html

St 1 and St 2

Even if we know the minimum of the set and sum of each class the max of each class could vary widely

E
Re: A certain language school has two classes for children.   [#permalink] 10 Sep 2017, 21:06
Display posts from previous: Sort by

A certain language school has two classes for children.

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.