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

Redeem

Again GMAT prep problem

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 55
Joined: Sat Nov 10, 2007 10:35 am
Thanked: 1 times

Again GMAT prep problem

by olika » Mon Jun 23, 2008 8:31 am
If a, b, and c are integers, what is the value of a?
1) (a-7)(b-7)(c-7)=0
2) bc=18

The answer "Both statements together are sufficient"

I just can't understand how it can be sufficient, if we have three unknowns and only two equations. :(
It seems there is no enough time during real GMAT test to multiply all terms to figure out the answer.

Sorry, if this question has appeared not the first time. I didn't find the answer.
Top
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 132
Joined: Sun Apr 27, 2008 10:31 am
Location: Portugal
Thanked: 7 times

by atlantic » Mon Jun 23, 2008 8:39 am
Hi Olika,

That is new for me. Is it from GMAT Prep?

(1) says that a=7 or b=7 or c=7, so INSUFF, as when b=7 'a' can be any other integer.

(2) bc=18, tell us nothing about A so INSUFF

(1+2) if bc=18 then neither 'b' nor 'c' can be 7 (remind that a, b and c must be integers), since 18 is not a multiple of 7. If 'b' and 'c' are not 7 then 'a' must be.

Answer C
Top
Senior | Next Rank: 100 Posts
Posts: 55
Joined: Sat Nov 10, 2007 10:35 am
Thanked: 1 times

by olika » Mon Jun 23, 2008 8:46 am
Hi!
Thank you very much for clear explanation!
Right now the decision seems obvious for me :)
How can I not to guess by myself!?

Yes, that question was from GMAT Preparation
Top
Post new topic Post Reply
• Page 1 of 1