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

It is currently 22 Sep 2014, 22:46

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

a is divisible by 60 . b is not divisible by 21. Is a*b

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
CEO
CEO
avatar
Joined: 15 Aug 2003
Posts: 3470
Followers: 60

Kudos [?]: 670 [0], given: 781

a is divisible by 60 . b is not divisible by 21. Is a*b [#permalink] New post 19 Sep 2003, 04:34
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
a is divisible by 60 . b is not divisible by 21. Is a*b divisible by
48?
a. a*b is divisible by 540
b. a^2 * b is divisible by 36

after you get your answer, check my work and tell me whether i am right?



1. a*b is divisible by 540

a*b = 540 s

540 not a mutliple of 48 and so a*b not divisible by 48...
sufficient

2. a^2 * b is divisible by 36

a^2 * b = 36 q ... equation 1
we know a = 60 n ...equation 2

Divide 1 by 2 a* b = 36/60 qn
a* b = 6/10 qn
if qn= 80 or any other multiple of 80, yes ...but otherwise no
so insufficient

so A by itself is sufficient



thanks
Intern
Intern
avatar
Joined: 16 Jul 2003
Posts: 32
Followers: 0

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

 [#permalink] New post 19 Sep 2003, 22:48
Quote:
a*b is divisible by 540

a*b = 540 s

540 not a mutliple of 48 and so a*b not divisible by 48...
sufficient


I don't agree with this. Say a*b = 8640(=540*16). Here a=60 & b = 144. Meets all the conditions. and is divisible by 48. but if a*b = 540, its not divisible by 48. So Not sufficient.



Quote:
a^2 * b is divisible by 36

a^2 * b = 36 q ... equation 1
we know a = 60 n ...equation 2

Divide 1 by 2 a* b = 36/60 qn
a* b = 6/10 qn
if qn= 80 or any other multiple of 80, yes ...but otherwise no
so insufficient

Agree with this. So 2 alone is insufficient.

Now, combine 1 & 2 -

Say a* b is 8640(a=60 and b=144) here all conditions are satisfied and is divisible by 48.
Now, say a* b is 540(a=60, b= 9) , here also all the conditions are satisfied but not divisible by 48.
So Insufficient.
Hence E.
Pls. let me know if I'm missing anything.
  [#permalink] 19 Sep 2003, 22:48
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic Is a*b*c divisible by 24? (1) a,b, and c are consecutive dexerash 3 28 May 2012, 04:06
2 Experts publish their posts in the topic Is a*b*c divisible by 24? (1) a,b, and c are consecutive tarn151 9 12 Dec 2010, 19:06
Is a+b divisible by 7? a and b are both +ve integers. 1) a paam0101 3 04 Aug 2010, 10:29
Experts publish their posts in the topic Is ab divisible by c? 1. a is not divisible by c 2. b is not devilmirror 1 01 Dec 2007, 16:36
Is a*b*c is divisible by 32? 1. a,b and c are consecutive Juaz 8 24 May 2007, 00:48
Display posts from previous: Sort by

a is divisible by 60 . b is not divisible by 21. Is a*b

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.