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

It is currently 18 Apr 2014, 18:06

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

The average of 8 numbers is 21 .I f each of the numbers is

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
Joined: 30 Aug 2003
Posts: 326
Location: dallas , tx
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
The average of 8 numbers is 21 .I f each of the numbers is [#permalink] New post 14 Oct 2003, 09:16
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
The average of 8 numbers is 21 .I f each of the numbers is multiplied by 8, the average of the new set of numbers is?
A. 8
B. 21
C. 29
D. 168
_________________

shubhangi

Manager
Manager
Joined: 26 Aug 2003
Posts: 233
Location: United States
Followers: 1

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

GMAT Tests User
 [#permalink] New post 14 Oct 2003, 09:38
168

(n + (n + 1) + (n + 2) + ... + (n + 7)) / 8 = 21 ...... (1)

(8n + 8(n + 1) + ... + 8(n + 7))/8 = ?
= 8 * (n + (n + 1) + ... + (n + 7))/8
= 8 * 21 [ using (1) ]
= 168

Of course,
The other way doing this is by balancing out the original equation by multiplying by 8 on both sides.
Intern
Intern
Joined: 03 May 2003
Posts: 28
Followers: 0

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

question [#permalink] New post 14 Oct 2003, 17:04
wonder_gmat wrote:
168

(n + (n + 1) + (n + 2) + ... + (n + 7)) / 8 = 21 ...... (1)

(8n + 8(n + 1) + ... + 8(n + 7))/8 = ?
= 8 * (n + (n + 1) + ... + (n + 7))/8
= 8 * 21 [ using (1) ]
= 168

Of course,
The other way doing this is by balancing out the original equation by multiplying by 8 on both sides.


Wonder,
Does your solution assume that the nums are consecutive?

Thanks,
exy18
Manager
Manager
Joined: 26 Aug 2003
Posts: 233
Location: United States
Followers: 1

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

GMAT Tests User
Re: question [#permalink] New post 14 Oct 2003, 17:14
exy18 wrote:
wonder_gmat wrote:
168

(n + (n + 1) + (n + 2) + ... + (n + 7)) / 8 = 21 ...... (1)

(8n + 8(n + 1) + ... + 8(n + 7))/8 = ?
= 8 * (n + (n + 1) + ... + (n + 7))/8
= 8 * 21 [ using (1) ]
= 168

Of course,
The other way doing this is by balancing out the original equation by multiplying by 8 on both sides.


Wonder,
Does your solution assume that the nums are consecutive?

Thanks,
exy18

Not necessarily. I just used consecutive integers here for sake of ease in explaining. The bottom line is you have to multiply the original average by the same number that you multiply the original numbers.
Senior Manager
Senior Manager
Joined: 21 Aug 2003
Posts: 258
Location: Bangalore
Followers: 1

Kudos [?]: 3 [0], given: 0

GMAT Tests User
 [#permalink] New post 14 Oct 2003, 20:14
To write it siimply:
(x1 + x2 +... + x8)/8 = 21 (given) ............ a

Multiply both sides of equation a by 8

(8*x1 + 8*x2 +.... + 8*x8)/8 = 21*8 = 168

thanks
  [#permalink] 14 Oct 2003, 20:14
    Similar topics Author Replies Last post
Similar
Topics:
New posts the average of 5 consecutive numbers is 87. if each of the christoph 9 15 Feb 2005, 02:53
New posts The function F of a number is the square of that number mandy 4 24 Aug 2005, 04:07
New posts There are 6 numbers, A,B,C,D,E,F and their average is 42. Is Jamesk486 3 02 Jun 2007, 10:22
New posts 1 Numbers 8 virtualanimosity 1 06 Nov 2009, 05:13
New posts 1 Experts publish their posts in the topic The average (arithmetic mean) of 6 numbers is 8.5. When one Bunuel 4 07 Feb 2014, 04:48
Display posts from previous: Sort by

The average of 8 numbers is 21 .I f each of the numbers is

  Question banks Downloads My Bookmarks Reviews Important topics  


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

Powered by phpBB © phpBB Group and phpBB SEO

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®.