Data Sufficiency Kaplan..

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Gmatterz: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Sep 22, 2008 1:47 am

by Gmatterz » Sun Sep 28, 2008 9:21 pm

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

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Source: Beat The GMAT — Data Sufficiency | Sun Sep 28, 2008 9:21 pm

mjjking: Master | Next Rank: 500 Posts; Posts: 353; Joined: Sat Jan 20, 2007 1:29 am; Location: Italy; Thanked: 7 times; GMAT Score:720

by mjjking » Mon Sep 29, 2008 2:04 am

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.

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Gmatterz: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Sep 22, 2008 1:47 am

by Gmatterz » Mon Sep 29, 2008 2:40 am

The OA is E...Really confused...

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GMAT/MBA Expert

Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members; Location: Montreal; Thanked: 1090 times; GMAT Score:780

by Ian Stewart » Mon Sep 29, 2008 5:11 am

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.

For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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Gmatterz: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Sep 22, 2008 1:47 am

Thanks

by Gmatterz » Mon Sep 29, 2008 9:08 am

Hi Ian ,
Thanks a Million for clearing my confusion.Its crystal clear now why the anwser would be E.

Thanks
Gmatterz

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