Last visit was: 21 May 2024, 13:36 It is currently 21 May 2024, 13:36
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.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
Math Expert
Joined: 02 Sep 2009
Posts: 93373
Own Kudos [?]: 625612 [4]
Given Kudos: 81918
Send PM
Director
Director
Joined: 18 Jul 2018
Posts: 925
Own Kudos [?]: 1302 [4]
Given Kudos: 95
Location: India
Concentration: Operations, General Management
GMAT 1: 590 Q46 V25
GMAT 2: 690 Q49 V34
WE:Engineering (Energy and Utilities)
Send PM
Board of Directors
Joined: 11 Jun 2011
Status:QA & VA Forum Moderator
Posts: 6069
Own Kudos [?]: 4705 [0]
Given Kudos: 463
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Send PM
VP
VP
Joined: 31 Oct 2013
Posts: 1260
Own Kudos [?]: 1169 [0]
Given Kudos: 635
Concentration: Accounting, Finance
GPA: 3.68
WE:Analyst (Accounting)
Send PM
Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
Bunuel wrote:
If r is divisible by 10 and s is divisible by 9, rs must have at least how many factors?

(A) Two
(B) Four
(C) Twelve
(D) Fourteen
(E) Sixteen



r is divisible by 10

s is divisible by

rs could be 90 or its multiples.

let's factorize 90 = 5*2*3*3 = 3^2 * 5 * 2

Total number of factors: (2+1) (1+1) ( 1+1) = 12

The best answer is C.
Intern
Intern
Joined: 22 Mar 2021
Posts: 3
Own Kudos [?]: 0 [0]
Given Kudos: 4
Send PM
If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
What if we pick 0 as the first example, wouldn't the answer be 2? I mean isn't 0 divisible by any number except itself?
User avatar
Non-Human User
Joined: 09 Sep 2013
Posts: 33141
Own Kudos [?]: 829 [0]
Given Kudos: 0
Send PM
Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
GMAT Club Bot
Re: If r is divisible by 10 and s is divisible by 9, rs must have at least [#permalink]
Moderator:
Math Expert
93373 posts