BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Greater common divisior

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Source: — Data Sufficiency |
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Thu Dec 18, 2008 11:57 am
I am getting B)

Stmt II

a=3b

a will have one extra 3 and all the factors of b so b will be gcd of a and and b

SUFF

Stmt I

a= 3b+6
b=6 a = 24

YES

b=12 a=42

NO

INSUFF

Whats the OA?
Top
Senior | Next Rank: 100 Posts
Posts: 95
Joined: Fri Sep 28, 2007 10:16 am
Thanked: 6 times
GMAT Score:710

by muzali » Thu Dec 18, 2008 12:08 pm
given: a and b are both divisible by 6

Stm1: a=3b+6
or (a/3)=b+2
because of this "+2" it is insuff to conclude that b is the gcd of (a,b)

Stm2: a=3b
suff because b will be the gcd of (3b,b) i.e., (a,b)

ans:B
Top
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 03, 2008 9:30 am
Thanked: 15 times
Followed by:2 members

by schumi_gmat » Thu Dec 18, 2008 12:30 pm
B for me too.

a= 3b
if b = 6, a = 18 and GCD = 6

b= 12, a = 36 and GCD = 12

Hence B
Top
Post new topic Post Reply
• Page 1 of 1