If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x : DS Archive
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 19 Jan 2017, 12:17

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x

Author Message
Director
Joined: 18 Feb 2008
Posts: 798
Followers: 21

Kudos [?]: 119 [0], given: 25

If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x [#permalink]

Show Tags

14 Jun 2008, 12:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If x is a positive integer, is $$\sqrt{x} \lt 2.5x - 5?$$

1. $$x \lt 3$$
2. $$x$$ is a prime number
Manager
Joined: 08 Jun 2008
Posts: 50
Followers: 0

Kudos [?]: 9 [0], given: 0

Show Tags

14 Jun 2008, 12:24
IMO , ans is A

if X < 3 then x can be 2 u can take it as 1 too if u consider 1 as prime .. i dont

use both values in the stem equation .. u get same ans - No hence sufficient

statement 2 says x is prime

if u take x as 2 u get sqrt (2) < o which is false
if u take x as 3 u get sqrt (3) < 2.5 which is true .. hence statement is insufficient
Director
Joined: 14 Oct 2007
Posts: 758
Location: Oxford
Schools: Oxford'10
Followers: 15

Kudos [?]: 214 [0], given: 8

Show Tags

14 Jun 2008, 12:27
billyjeans wrote:
If x is a positive integer, is $$\sqrt{x} \lt 2.5x - 5?$$

1. $$x \lt 3$$
2. $$x$$ is a prime number

1) x can be either 1 or 2
trying these we get either 1 > -2.5 or sqrt(2) > 0
as seen both of these yield a NO to the question
sufficient

2) x is prime
we already know from 1) that for 2 we get a NO

lets try other values
3: sqrt(3) < 2.5
5: sqrt(5) < 7.5

so definitely insufficient

Re: DS is x   [#permalink] 14 Jun 2008, 12:27
Display posts from previous: Sort by