[ 3 posts ]

 Print view Previous topic | Next topic

#### Question from a lab

Author Message
 Post subject: Question from a lab  Posted: Mon Apr 05, 2010 7:18 pm
 Course Students

Posts: 1
 In lab 5, slide 21 a problem is presented:If R and S are integers,is R + S divisible by 3?(1) R is divisible by three(2) S is divisible by threeThe instructor said the answer was d (Both answers together are sufficient).What if R is -3?

 Post subject: Re: Question from a lab  Posted: Tue Apr 06, 2010 10:32 am
 Students

Posts: 33
 If R is -3 anyway you need to know the value of S. I suppose your question is what if R is -3 and S is 3. In this case the value R+S will be 0 which is divisible by 3.So both statements together are sufficient to answer this question.

 Post subject: Re: Question from a lab  Posted: Fri Apr 09, 2010 2:38 pm
 Course Students

Posts: 37
 This questions answer would be C - You need both statement to answer this. If you go through the first Math book i.e Number properties. It has a statement about divisibility that any number which is a multiple of X will be divisible by X even when another multiple of X is added or subtracted.Ex- 3(call it R) is a multiple of 3 (call it X) 18(call it S) is also a multiple 3.So 3 + 18 = 21 is also divisible by 3 or is a multiple of 3Same holds true for -3 + 18 = 15 which is again divisible by 3.I hope this resolves your doubt when R or S is -3.

Display posts from previous:  Sort by

[ 3 posts ]

#### Who is online

 Users browsing this forum: No registered users and 1 guest

 You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum

Search for:
 Jump to:  Select a forum ------------------ Ask An Instructor    General GMAT Strategy Questions    GMAT Math       General Math Questions       GMAT Prep Math       Manhattan GMAT CAT Math       Manhattan GMAT Non-CAT Math       Official Guide Math    GMAT Verbal       General Verbal Questions       GMAT Prep Verbal       Manhattan GMAT CAT Verbal       Manhattan GMAT Non-CAT Verbal       Official Guide Verbal    GMAT Integrated Reasoning (IR)       GMAT Prep IR       Manhattan GMAT CAT IR       Manhattan GMAT Non-CAT IR    GMAT AWA Essays Manhattan GMAT    Ask Student Services    Study Groups    GMAT Test Day    Test Centers    Instructor Feedback    Course Feedback B-School    Ask an mbaMission Admissions Consultant    B-School Essays    Business Schools    Professional Networking