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

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06 Feb 2016, 13:35

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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?

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

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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 .....

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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06 Sep 2017, 12:46

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