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

 It is currently 03 Jul 2015, 18:00

### 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 p,s, and t are positive prime numbers, what is the value

Author Message
TAGS:
Manager
Joined: 23 Mar 2008
Posts: 220
Followers: 2

Kudos [?]: 40 [0], given: 0

If p,s, and t are positive prime numbers, what is the value [#permalink]  04 Jun 2008, 12:19
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions
If p,s, and t are positive prime numbers, what is the value of p^3 * s^3 * t^3?
1) p^3 *st=728
2) t=13
Manager
Joined: 31 Oct 2007
Posts: 116
Followers: 1

Kudos [?]: 12 [0], given: 0

Re: DS: prime numbers [#permalink]  04 Jun 2008, 14:51
Quote:
If p,s, and t are positive prime numbers, what is the value of p^3 * s^3 * t^3?
1) p^3 *st=728
2) t=13

To calculate we need p,q and t
A- Alone not sufficient.
B- Alone not sufficient
But if you combine it togeter
p^3 * s = 728/13=56,

Now, p must be 2, since 1 or 3 wont work. So p=2, t=13 and s=7 Answer = C
_________________

Many people dream, but some wake up and work towards it.

Director
Joined: 23 Sep 2007
Posts: 793
Followers: 5

Kudos [?]: 108 [0], given: 0

Re: DS: prime numbers [#permalink]  04 Jun 2008, 16:51
A

(p^3)*(st) = 728 = 2^3 * 5 * 13

p = 2
s = 5 or 13
t = 13 or 5

but the actual number of s and t does not matter because s^3 * t^3 = (st)^3
so (5*13)^3 is the same as (13*5)^3 = (st)^3 = s^3 * t^3
SVP
Joined: 29 Aug 2007
Posts: 2493
Followers: 59

Kudos [?]: 576 [0], given: 19

Re: DS: prime numbers [#permalink]  04 Jun 2008, 17:21
GMAT TIGER wrote:
puma wrote:
If p,s, and t are positive prime numbers, what is the value of p^3 * s^3 * t^3?
1) p^3 *st=728
2) t=13

is there anything missing?

sorry for the confusion:

1) p^3 *st=728
p^3 *st = 2x2x2x7x13

so p = 2, st = 7x13
suff...

2) t=13. nsf

C is a trap. so do not need st. 1 to answer. st 1 is suff....
_________________
Director
Joined: 05 Jan 2008
Posts: 707
Followers: 3

Kudos [?]: 158 [0], given: 0

Re: DS: prime numbers [#permalink]  05 Jun 2008, 00:40
A for me.

Almost went for C

728/8=91 and 91 can be only 13*7 thus A
_________________

Persistence+Patience+Persistence+Patience=G...O...A...L

CEO
Joined: 29 Mar 2007
Posts: 2585
Followers: 17

Kudos [?]: 243 [0], given: 0

Re: DS: prime numbers [#permalink]  05 Jun 2008, 05:45
puma wrote:
If p,s, and t are positive prime numbers, what is the value of p^3 * s^3 * t^3?
1) p^3 *st=728
2) t=13

Notice that p^3 *st=728 is an even number.

Also notice that the units digit is 8. This means that p must be 2.

728/8 = 91. s and t are only 2 primes so 91 is divisible by ONly two numbers (other than 1 and itself).

No more work needed here.

2: dsnt help us.

A
Re: DS: prime numbers   [#permalink] 05 Jun 2008, 05:45
Similar topics Replies Last post
Similar
Topics:
3 If p, s, and t are positive prime numbers, what is the value 7 22 Jan 2010, 23:18
1 if p, s, and t are positive prime numbers, what is the value 3 10 May 2009, 21:09
If x is a prime number, what is the value of x? 3 12 Apr 2009, 22:25
if p, s, and t are positive prime numbers, what is the value 3 10 Aug 2008, 01:25
If x is a prime number, what is the value of x? 3 17 May 2007, 17:07
Display posts from previous: Sort by

# If p,s, and t are positive prime numbers, what is the value

 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®.