GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 20 Aug 2018, 15:43

### 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

# In a party with more than three children, the average age (arithmetic

Author Message
TAGS:

### Hide Tags

Retired Moderator
Joined: 29 Apr 2015
Posts: 862
Location: Switzerland
Concentration: Economics, Finance
Schools: LBS MIF '19
WE: Asset Management (Investment Banking)
In a party with more than three children, the average age (arithmetic  [#permalink]

### Show Tags

28 Jul 2015, 11:38
5
00:00

Difficulty:

45% (medium)

Question Stats:

61% (01:08) correct 39% (01:25) wrong based on 101 sessions

### HideShow timer Statistics

In a party with more than three children, the average age (arithmetic mean) was 6. What is the average age of the remaining children in the party after three of the children have left?

(1) Each of the three children who left was of age 6.
(2) The average age of the three children who left was 6.

_________________

Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.

Current Student
Joined: 20 Mar 2014
Posts: 2643
Concentration: Finance, Strategy
Schools: Kellogg '18 (M)
GMAT 1: 750 Q49 V44
GPA: 3.7
WE: Engineering (Aerospace and Defense)
Re: In a party with more than three children, the average age (arithmetic  [#permalink]

### Show Tags

28 Jul 2015, 11:51
2
reto wrote:
In a party with more than three children, the average age (arithmetic mean) was 6. What is the average age of the remaining children in the party after three of the children have left?

(1) Each of the three children who left was of age 6.
(2) The average age of the three children who left was 6.

reto, the OA is D : https://gmat.economist.com/gmat-practic ... s-the-type

Let the number of children be n

S be the sum of the ages of the children

Thus Mean = S/n= 6 --> S =6n

Statement 1, 3 children of ages, 6,6,6 left. Thus the mean of the remaining children = $$\frac{S-18}{n-3}$$ = $$\frac{6n-18}{n-3}$$ = 6. Thus sufficient.

Statement 2 is identical to statement 1 and is thus sufficient. Average of 3 children =6 ---> sum of the ages of these 3 children = 3*6 = 18.

Retired Moderator
Joined: 29 Apr 2015
Posts: 862
Location: Switzerland
Concentration: Economics, Finance
Schools: LBS MIF '19
WE: Asset Management (Investment Banking)
Re: In a party with more than three children, the average age (arithmetic  [#permalink]

### Show Tags

28 Jul 2015, 12:56
Engr2012 wrote:
reto wrote:
In a party with more than three children, the average age (arithmetic mean) was 6. What is the average age of the remaining children in the party after three of the children have left?

(1) Each of the three children who left was of age 6.
(2) The average age of the three children who left was 6.

reto, the OA is D : https://gmat.economist.com/gmat-practic ... s-the-type

Let the number of children be n

S be the sum of the ages of the children

Thus Mean = S/n= 6 --> S =6n

Statement 1, 3 children of ages, 6,6,6 left. Thus the mean of the remaining children = $$\frac{S-18}{n-3}$$ = $$\frac{6n-18}{n-3}$$ = 6. Thus sufficient.

Statement 2 is identical to statement 1 and is thus sufficient. Average of 3 children =6 ---> sum of the ages of these 3 children = 3*6 = 18.

Of course. My "typo"! Thanks.
_________________

Saving was yesterday, heat up the gmatclub.forum's sentiment by spending KUDOS!

PS Please send me PM if I do not respond to your question within 24 hours.

Non-Human User
Joined: 09 Sep 2013
Posts: 7770
Re: In a party with more than three children, the average age (arithmetic  [#permalink]

### Show Tags

21 Jul 2018, 06:51
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.
_________________
Re: In a party with more than three children, the average age (arithmetic &nbs [#permalink] 21 Jul 2018, 06:51
Display posts from previous: Sort by

# Events & Promotions

 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®.