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

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Math Expert
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]

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21 Feb 2018, 22:59
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100% (00:43) correct 0% (00:00) wrong based on 34 sessions

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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
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]

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21 Feb 2018, 23:09
$$\frac{x+y+30}{3}$$= 10

x+y+30= 30

So, x+y=0

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

VP
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]

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22 Feb 2018, 01:28
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
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]

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22 Feb 2018, 02:48
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
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]

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23 Feb 2018, 00:06
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
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]

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23 Feb 2018, 01:42
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
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]

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26 Feb 2018, 10:43
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.

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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
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