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

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Current Student
Joined: 12 Aug 2015
Posts: 2638
Schools: Boston U '20 (M)
GRE 1: Q169 V154
A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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19 Apr 2017, 10:46
1
00:00

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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Joined: 06 Dec 2016
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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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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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Joined: 06 Dec 2016
Posts: 250
Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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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

Manager
Joined: 12 Oct 2015
Posts: 218
GMAT 1: 700 Q47 V39
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Re: A set has exactly five consecutive positive integers starting with 1.  [#permalink]

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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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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
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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