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

 It is currently 20 Sep 2014, 12:08

### 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

# If the average (arithmetic mean) of x, y, and 20 is 10

Author Message
TAGS:
Intern
Joined: 02 May 2005
Posts: 12
Followers: 0

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

If the average (arithmetic mean) of x, y, and 20 is 10 [#permalink]  01 Dec 2005, 13:31
1
This post was
BOOKMARKED
00:00

Difficulty:

(N/A)

Question Stats:

50% (02:25) correct 50% (00:01) wrong based on 2 sessions
If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?

A. 40
B. 45
C. 60
D. 75
E. 95
VP
Joined: 22 Aug 2005
Posts: 1128
Location: CA
Followers: 1

Kudos [?]: 29 [0], given: 0

E. 95

(x+y+20)/3 = 10 + (x + y + 50)/4

solve for (x+y)

find out : (x+y)/2
_________________

Whether you think you can or think you can't. You're right! - Henry Ford (1863 - 1947)

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 19

Kudos [?]: 143 [0], given: 0

(x+y+20)/3 -10 = (x+y+20+30)/4
(x+y)/3 + 20/3 -10 = (x+y)/4 + 50/4
(x+y)/12 = 95/6
(x+y)/2 = 95
Senior Manager
Joined: 03 Nov 2005
Posts: 399
Location: Chicago, IL
Followers: 3

Kudos [?]: 25 [0], given: 17

(x+y+20)/3=a and (x+y+20+30)/4=a-10

3a=x+y+20 and 4a-40=x+y+20+30

a=70

(x+y+20)/3=70; x+y=95
_________________

Hard work is the main determinant of success

Senior Manager
Joined: 14 Apr 2005
Posts: 422
Location: India, Chennai
Followers: 1

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

Re: one more PS [#permalink]  02 Dec 2005, 02:49
sem wrote:
If the average (arithmetic mean) of x, y, and 20 is 10 greater than the average of x, y, 20, and 30, what is the average of x and y?

A. 40
B. 45
C. 60
D. 75
E. 95

E - 95

(X+Y+20)/3 - (x+y+20+30)/4 = 10
Gives X+y = 190
or (X+Y)/2= 95
Re: one more PS   [#permalink] 02 Dec 2005, 02:49
Similar topics Replies Last post
Similar
Topics:
2 What is the average (arithmetic mean) of x and y? 4 24 Dec 2013, 02:42
2 If the average (arithmetic mean) of positive integers x, y, 9 21 Jul 2009, 21:25
If the average (arithmetic mean) of positive integers x, y, 4 08 Oct 2008, 12:31
The arithmetic mean (average) of a set of 10 numbers is 10. 16 26 Sep 2007, 07:07
2 If the average (arithmetic mean) of x and y is 60 and the av 10 23 Jul 2007, 18:33
Display posts from previous: Sort by