if b is not equals zero
and a>b
Is a>c?
1)a/b>c/b
2)5ab>6bc
Can anybody please help me out with the approach of solving the above DS question.
Thanks
Gmatterz
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Data Sufficiency Kaplan..
This topic has expert replies
-
mjjking
- Master | Next Rank: 500 Posts
- Posts: 353
- Joined: Sat Jan 20, 2007 1:29 am
- Location: Italy
- Thanked: 7 times
- GMAT Score:720
So... b is not 0. And a>b... a>c?
number 1. tells us that a/b > c/b ... but if a>b and hence a/b>1 it means that also a/c>1 hence a>c.
number 2 says that 5ab>6bc which can be written as 5a > 6c. This means that a>c.
hence both answers alone are sufficient.
number 1. tells us that a/b > c/b ... but if a>b and hence a/b>1 it means that also a/c>1 hence a>c.
number 2 says that 5ab>6bc which can be written as 5a > 6c. This means that a>c.
hence both answers alone are sufficient.
Beat The GMAT - 1st priority
Enter a top MBA program - 2nd priority
Loving my wife: MOST IMPORTANT OF ALL!
REAL THING 1 (AUG 2007): 680 (Q43, V40)
REAL THING 2 (APR 2009): 720 (Q47, V41)
Enter a top MBA program - 2nd priority
Loving my wife: MOST IMPORTANT OF ALL!
REAL THING 1 (AUG 2007): 680 (Q43, V40)
REAL THING 2 (APR 2009): 720 (Q47, V41)
GMAT/MBA Expert
-
Ian Stewart
- GMAT Instructor
- Posts: 2621
- Joined: Mon Jun 02, 2008 3:17 am
- Location: Montreal
- Thanked: 1090 times
- Followed by:355 members
- GMAT Score:780
When analysing the statements, be sure to consider the possibility that b is negative. For example, when considering the first statement:
a/b > c/b
If b > 0, we can multiply both sides by b to find:
If b > 0, then a > c
However, if b is negative, when we multiply both sides by b, we need to reverse the inequality:
If b < 0, then a < c
The analysis is similar for the second statement.
a/b > c/b
If b > 0, we can multiply both sides by b to find:
If b > 0, then a > c
However, if b is negative, when we multiply both sides by b, we need to reverse the inequality:
If b < 0, then a < c
The analysis is similar for the second statement.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com
ianstewartgmat.com
ianstewartgmat.com
