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a, b, c, d, and e are five consecutive numbers in increasing order

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a, b, c, d, and e are five consecutive numbers in increasing order [#permalink]

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New post 06 Feb 2016, 13:35
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A
B
C
D
E

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Question Stats:

72% (00:55) correct 28% (00:23) wrong based on 54 sessions

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a, b, c, d, and e are five consecutive numbers in increasing order of size. Deleting one of the five
numbers from the set decreased the sum of the remaining numbers in the set by 20%. Which one of
the following numbers was deleted?


(A) a
(B) b
(C) c
(D) d
(E) e

Source: GMAT Math Bible
[Reveal] Spoiler: OA

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Re: a, b, c, d, and e are five consecutive numbers in increasing order [#permalink]

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New post 06 Feb 2016, 14:00
Let's say that those numbers are , 1,2,3,4,5. So the sum will be 15. Now what is the 20% of 15 ? It's gonna be 3. So 15-3= 12 which is the sum of 1+2+4+5 .....

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Re: a, b, c, d, and e are five consecutive numbers in increasing order [#permalink]

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New post 06 Feb 2016, 14:01
a+b+c+d+e => 1+2+3+4+5=15

20%*15= 3 =>c
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Re: a, b, c, d, and e are five consecutive numbers in increasing order [#permalink]

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New post 07 Feb 2016, 04:49
BrainLab wrote:
a, b, c, d, and e are five consecutive numbers in increasing order of size. Deleting one of the five
numbers from the set decreased the sum of the remaining numbers in the set by 20%. Which one of
the following numbers was deleted?


(A) a
(B) b
(C) c
(D) d
(E) e

Source: GMAT Math Bible


Hi,
five consecutive numbers will have average as the centre number, c.
sum =5*c..
we want 20% less= 5c*80/100=4c..
the number being deducted=5c-4c=c..
C
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Re: a, b, c, d, and e are five consecutive numbers in increasing order [#permalink]

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New post 06 Sep 2017, 12:46
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Re: a, b, c, d, and e are five consecutive numbers in increasing order   [#permalink] 06 Sep 2017, 12:46
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