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

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New post 21 Feb 2018, 22:59
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E

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Question Stats:

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
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Joined: 07 Jul 2012
Posts: 365
Location: India
Concentration: Finance, Accounting
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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

Answer: A.
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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

Answer: A
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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
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Re: If the average of x, y, and 30 is 10, then the average of x and y is  [#permalink]

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New post 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.

Answer: A
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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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