Last visit was: 22 Apr 2026, 21:38 It is currently 22 Apr 2026, 21:38
Home
Messages
Tests
Schools
Events
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
User avatar
dimri10
User avatar
Joined: 16 May 2011
Last visit: 25 Sep 2023
Posts: 237
Own Kudos:
356
Given Kudos: 64
Concentration: Finance, Real Estate
GMAT Date: 12-27-2011
WE:Law (Law)
Posts: 237
Kudos: 356
ALGEBRA 06 Jul 2011, 13:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
N
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:00) wrong based on 4 sessions

History

Date
Time
Result
Not Attempted Yet
1. If k and (0.025*0.0025*0.00025*10^k
) are integers, what is the least possible value of k? (A) 10
(B) 12
(C) 13
(D) -10
(E) -12



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
User avatar
gijoedude
User avatar
Joined: 17 May 2010
Last visit: 13 Jul 2013
Posts: 197
Own Kudos:
113
Given Kudos: 7
GMAT 1: 710 Q47 V40
GMAT 1: 710 Q47 V40
Posts: 197
Kudos: 113
ALGEBRA 06 Jul 2011, 13:46
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Is the OA B? Convert the decimals into fractions and see what value of K results in an integer.
avatar
vrk002
avatar
Joined: 08 Mar 2011
Last visit: 28 Jul 2011
Posts: 6
Own Kudos:
2
Given Kudos: 13
Posts: 6
Kudos: 2
ALGEBRA 06 Jul 2011, 14:35
Kudos
Add Kudos
Bookmarks
Bookmark this Post
K >= 11, therefore answer is B
avatar
katealpha
avatar
Joined: 05 Oct 2010
Last visit: 02 Dec 2011
Posts: 7
Own Kudos:
1
Given Kudos: 19
Posts: 7
Kudos: 1
ALGEBRA 06 Jul 2011, 14:58
Kudos
Add Kudos
Bookmarks
Bookmark this Post
dimri10
1. If k and (0.025*0.0025*0.00025*10^k
) are integers, what is the least possible value of k? (A) 10
(B) 12
(C) 13
(D) -10
(E) -12
Show more


For this particular problem I prefere to use fractions
25/1000 * 25/10000 * 25/ 100000 * 10^k = 15625/1 000 000 000 000 * 10^k
To assure that 15625/1 000 000 000 000 is an integer we need to cancel all the zeros in the denominator. Thus the smallest possible value for k is 12 (B)
User avatar
Spidy001
User avatar
Joined: 01 Feb 2011
Last visit: 16 Feb 2015
Posts: 298
Own Kudos:
355
Given Kudos: 42
Posts: 298
Kudos: 355
ALGEBRA 06 Jul 2011, 17:41
Kudos
Add Kudos
Bookmarks
Bookmark this Post
My answer is A.

25*(10^-3) *25*(10^-4)*(10^k)

=625*(10^(k-7)).


for this number to be a integer k-7 has to be 1 2 3 4 .....

=> k has to 8 or 9 or 10 or 11

so with the answer options we have , least possible value of k is 10

Answer is A.
avatar
katealpha
avatar
Joined: 05 Oct 2010
Last visit: 02 Dec 2011
Posts: 7
Own Kudos:
1
Given Kudos: 19
Posts: 7
Kudos: 1
ALGEBRA 07 Jul 2011, 12:21
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Spidy001
My answer is A.

25*(10^-3) *25*(10^-4)*(10^k)

=625*(10^(k-7)).


for this number to be a integer k-7 has to be 1 2 3 4 .....

=> k has to 8 or 9 or 10 or 11

so with the answer options we have , least possible value of k is 10

Answer is A.
Show more
You have skipped one part in your calculcation.
25*(10^-3) x 25*(10^-4) x 25* (10^-5)
User avatar
piyatiwari
User avatar
Joined: 28 Jun 2009
Last visit: 15 Jun 2021
Posts: 312
Own Kudos:
444
Given Kudos: 46
Location: United States (MA)
Posts: 312
Kudos: 444
ALGEBRA 07 Jul 2011, 13:23
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Simplifying,

625*[10^(K-12)]

(B) 12



Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Problem Solving (PS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
Moderator:
Bunuel
Math Expert
109754 posts