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Larry saves x dollars per month. Will Larry s total savings

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Larry saves x dollars per month. Will Larry s total savings [#permalink] New post 06 Oct 2010, 06:10
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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
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Re: Savings DS [#permalink] New post 06 Oct 2010, 06:36
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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.

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