Larry saves x dollars per month. Will Larry s total savings : GMAT Data Sufficiency (DS)
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# Larry saves x dollars per month. Will Larry s total savings

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Joined: 17 Nov 2009
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Larry saves x dollars per month. Will Larry s total savings [#permalink]

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06 Oct 2010, 06:10
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35% (medium)

Question Stats:

68% (02:10) correct 32% (01:01) wrong based on 22 sessions

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Larry saves x dollars per month. Will Larry’s total savings one year from now exceed his present savings by at least $500 ? (Assume that there is no interest.) (1) In 6 months Larry's total savings will be$900.
(2) In 3 months Larry's total savings will exceed his present savings by $150. Please explain why statement 1 is not sufficient [Reveal] Spoiler: OA Math Expert Joined: 02 Sep 2009 Posts: 36509 Followers: 7063 Kudos [?]: 92870 [1] , given: 10528 Re: Savings DS [#permalink] ### Show Tags 06 Oct 2010, 06:36 1 This post received KUDOS Expert's post agnok wrote: Larry saves x dollars per month. Will Larry’s total savings one year from now exceed his present savings by at least$500 ? (Assume that there is no interest.)

(1) In 6 months Larry's total savings will be $900. (2) In 3 months Larry's total savings will exceed his present savings by$150.

Please explain why statement 1 is not sufficient

Let's say Larry's present savings is $$y$$.
Question: is $$12x+y>y+500$$? --> is $$12x>500$$?

(1) $$y+6x=900$$, not sufficient to say whether $$12x>500$$ (or whether $$6x>250$$).
(2) $$y+3x=y+150$$ --> $$x=50$$ --> $$12x=600>500$$. Sufficient.

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Re: Savings DS   [#permalink] 06 Oct 2010, 06:36
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