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

 It is currently 04 May 2015, 03:34

### 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 certain group of people, the average (arithmetic mean)

Author Message
TAGS:
SVP
Joined: 30 Mar 2006
Posts: 1739
Followers: 1

Kudos [?]: 46 [0], given: 0

In a certain group of people, the average (arithmetic mean) [#permalink]  17 Jun 2006, 10:12
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
In a certain group of people, the average (arithmetic mean) weight of the males is 180 pounds and of the females, 120 pounds. What is the average weight of the people in the group?
(1) The group contains twice as many females as males.
(2) The group contains 10 more females than males.
Director
Joined: 06 May 2006
Posts: 781
Followers: 3

Kudos [?]: 16 [0], given: 0

A

#1. twice as many females

we get avg = [2k(120) + k(180)]/3k
k eliminated; sufficient

#2. 10 more females
unknown cannot be eliminated; insufficient
VP
Joined: 21 Sep 2003
Posts: 1066
Location: USA
Followers: 3

Kudos [?]: 39 [1] , given: 0

1
KUDOS
A?
m = num of males
f = num of females
Avg = (180*m+120*f)/(m+f)

1. f = 2m
Avg = (180*m+120*2m)/(m+2m) = 420/3 = 140. SUFF
2. f = m+10
Avf = {180*m+120(m+10)}/(m+m+10) = (300m+1200)/(2m+10) INSUFF

Hence A.
_________________

"To dream anything that you want to dream, that is the beauty of the human mind. To do anything that you want to do, that is the strength of the human will. To trust yourself, to test your limits, that is the courage to succeed."

- Bernard Edmonds

Intern
Joined: 07 Apr 2006
Posts: 10
Followers: 1

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

??? OA: A or D??? I got A too, but you said good work the answer is D?
VP
Joined: 15 Jun 2006
Posts: 1124
Schools: Chicago Booth
Followers: 4

Kudos [?]: 40 [0], given: 0

A

Similar topics Replies Last post
Similar
Topics:
If the average (arithmetic mean) annual income for a group 6 20 Mar 2011, 06:51
1 Is the average (arithmetic mean) of a certain series of 2 18 Apr 2010, 12:45
1 What is the average (arithmetic mean) height of the n people 4 21 Mar 2010, 09:49
What is the average (arithmetic mean) height of the n people 2 13 Jun 2009, 10:07
What is the average (arithmetic mean) height of the n people 4 10 Oct 2005, 11:15
Display posts from previous: Sort by