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

 It is currently 05 Dec 2019, 12:36 ### 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

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  # If the average of x, y, and 30 is 10, then the average of x and y is

Author Message
TAGS:

### Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 59561
If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

1 00:00

Difficulty:

(N/A)

Question Stats: 100% (00:43) correct 0% (00:00) wrong based on 34 sessions

### HideShow timer Statistics

If the average of x, y, and 30 is 10, then the average of x and y is

(A) 0

(B) 5

(C) 15/2

(D) 10

(E) 30
Senior Manager  P
Joined: 07 Jul 2012
Posts: 365
Location: India
Concentration: Finance, Accounting
GPA: 3.5
Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

$$\frac{x+y+30}{3}$$= 10

x+y+30= 30

So, x+y=0

Average of x and y= $$\frac{x+y}{2}$$= $$\frac{0}{2}$$= 0

VP  D
Joined: 31 Oct 2013
Posts: 1489
Concentration: Accounting, Finance
GPA: 3.68
WE: Analyst (Accounting)
Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

Bunuel wrote:
If the average of x, y, and 30 is 10, then the average of x and y is

(A) 0

(B) 5

(C) 15/2

(D) 10

(E) 30

(x+y+30)/3=10
x+y+30=30
(x+y)/2=0/2
0
SVP  V
Joined: 26 Mar 2013
Posts: 2343
Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

Apply average formula:

$$\frac{x+y+30}{3}$$= 10

x+y+30= 30

x+y=0.........No need to bother calculate as it is always ZERO

Manager  S
Joined: 23 Sep 2016
Posts: 232
Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

Bunuel wrote:
If the average of x, y, and 30 is 10, then the average of x and y is

(A) 0

(B) 5

(C) 15/2

(D) 10

(E) 30

IMO A x+y+30= 10*3= 30
then X+Y=0 and their average is X+Y/2=0/2 =0
Current Student P
Joined: 07 Jan 2016
Posts: 1081
Location: India
GMAT 1: 710 Q49 V36 Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

Bunuel wrote:
If the average of x, y, and 30 is 10, then the average of x and y is

(A) 0

(B) 5

(C) 15/2

(D) 10

(E) 30

x+y+30/3 = 10

x+y+30 = 30

x+y = 0

avg = 0

(A) imo
Target Test Prep Representative G
Affiliations: Target Test Prep
Joined: 04 Mar 2011
Posts: 2809
Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

### Show Tags

Bunuel wrote:
If the average of x, y, and 30 is 10, then the average of x and y is

(A) 0

(B) 5

(C) 15/2

(D) 10

(E) 30

Since the average of x, y, and 30 is 10, we have:

(x + y + 30)/3 = 10

x + y + 30 = 30

x + y = 0

So the average of x and y is (x + y)/2 = 0/2 = 0.

_________________

# Jeffrey Miller

Jeff@TargetTestPrep.com

See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews

If you find one of my posts helpful, please take a moment to click on the "Kudos" button. Re: If the average of x, y, and 30 is 10, then the average of x and y is   [#permalink] 26 Feb 2018, 10:43
Display posts from previous: Sort by

# If the average of x, y, and 30 is 10, then the average of x and y is  