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If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1

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If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 04:11
1
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A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

88% (00:41) correct 12% (00:40) wrong based on 35 sessions

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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 04:55
Bunuel wrote:
If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 11 + 25 + p=

A. 16
B. 44
C. 56
D. 60
E. 64



8 + 11 + 25 + p/ 4 = 15
sum = 60
IMO D
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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 04:58
\(\frac{8 + 11 + 25 + p}{4}\) = 15

8 + 11 + 25 + p = 60

OPTION: D
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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 05:16
IMO D

The trick is not to misread the question and assume it was asking only for P

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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 05:46
Level 400 question =)))

A= S/n

n = 4, A = 15, S = (8+11+25+p)

=> (8+11+25+p) = 4 x 15 = 60

Answer D.
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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 11:22
Bunuel wrote:
If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 11 + 25 + p=

A. 16
B. 44
C. 56
D. 60
E. 64
\(8 + 11 + 25 + p = 15*4 = 60\), Answer must be (D) 60
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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1  [#permalink]

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New post 14 Jan 2019, 19:00
Bunuel wrote:
If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 11 + 25 + p=

A. 16
B. 44
C. 56
D. 60
E. 64


We use the formula for the average to create the equation:

(8 + 11 + 25 + p)/4 = 15

8 + 11 + 25 + p = 60

Answer: D
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Re: If the average (arithmetic mean) of 8, 11, 25, and p is 15, then 8 + 1   [#permalink] 14 Jan 2019, 19:00
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