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A set has exactly five consecutive positive integers starting with 1.

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A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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New post 19 Apr 2017, 10:46
1
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

81% (01:48) correct 19% (01:46) wrong based on 54 sessions

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A set has exactly five consecutive positive integers starting with 1.What is the percentage decrease in the average when the greatest number is removed from the set?

A)5
B)8.5
C)12.5
D)15.2
E)16.6



Source => NOVA.

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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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New post 19 Apr 2017, 11:41
Considering set to be 1,2,3,4,5
% decrease turns out to 0.5/3 after removing greatest number

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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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New post 19 Apr 2017, 12:07
1, 2, 3, 4, 5
average is 3

1, 2, 3, 4
average is 2.5

(3 - 2.5)/3 x 100 = 16.6

Answer is E
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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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New post 24 May 2017, 13:34
Good question Stonecold. 1+2+3+4+5 = 15/3 (Avg of 3) 1...4 = 10/4 (avg of 2.5) Decrease of 0.5

0.5/3 or 5/30 = 1/6 or 16.67%
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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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New post 24 May 2017, 18:31
stonecold wrote:
A set has exactly five consecutive positive integers starting with 1.What is the percentage decrease in the average when the greatest number is removed from the set?

A)5
B)8.5
C)12.5
D)15.2
E)16.6



Source => NOVA.


(10/4)/(15/5)=5/6
1-(5/6)=1/6=16.6 % decrease
E
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Re: A set has exactly five consecutive positive integers starting with 1. &nbs [#permalink] 24 May 2017, 18:31
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A set has exactly five consecutive positive integers starting with 1.

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