Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 04 May 2015, 02:08

### 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

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Director
Joined: 18 Feb 2008
Posts: 798
Followers: 20

Kudos [?]: 92 [0], given: 25

If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x [#permalink]  14 Jun 2008, 12:11
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
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: 51
Followers: 0

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

Re: DS is x [#permalink]  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: 759
Location: Oxford
Schools: Oxford'10
Followers: 13

Kudos [?]: 183 [0], given: 8

Re: DS is x [#permalink]  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
Similar topics Replies Last post
Similar
Topics:
4 If x is a positive integer, is sqrt(x) < 2.5*x - 5 ? 1) x 4 14 Mar 2010, 12:09
If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x 2 09 Sep 2008, 17:26
Is 2 < x < 4? 1) x - 5x + 6 < 0 2) 5x - 25x > 0 4 28 Jul 2008, 05:03
If x is a positive integer, is \sqrt{x} \lt 2.5x - 5? 1. x 8 05 Mar 2008, 16:31
If x is a positive integer is sqrt(x) an integer? 1) 10 05 Nov 2005, 19:52
Display posts from previous: Sort by

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

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group and phpBB SEO Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.