What is the value of k - m ?
1. (k-m)^3=8
2. (k-m)^5=32
Now, the official answer to this question is D (each statement is true by itself). My initial thought was two equations and two variables means substitution, C. Experts can you please advise....
Math Question
This topic has expert replies
-
- Junior | Next Rank: 30 Posts
- Posts: 12
- Joined: Sun Nov 25, 2012 8:01 pm
GMAT/MBA Expert
- Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
The big difference here is that we aren't asked to find the individual values of k and m. We're asked to find the difference k-m.Codebreaker2k wrote:What is the value of k - m ?
1. (k-m)^3=8
2. (k-m)^5=32
Now, the official answer to this question is D (each statement is true by itself). My initial thought was two equations and two variables means substitution, C. Experts can you please advise....
If we let k-m = "thing," we can rephrase the entire question to read:
What is the value of thing?
1. (thing)^3=8
Thing must equal 2, so statement 1 is sufficient.
2. (thing)^5=32
Thing must equal 2, so statement 2 is sufficient.
Answer: D
Cheers,
Brent
GMAT/MBA Expert
- Brent@GMATPrepNow
- GMAT Instructor
- Posts: 16207
- Joined: Mon Dec 08, 2008 6:26 pm
- Location: Vancouver, BC
- Thanked: 5254 times
- Followed by:1268 members
- GMAT Score:770
The notion that two equations are required whenever we have two variables in a Data Sufficiency question is a myth (and a common trap on the GMAT).
This (and other myths) is covered in these two free videos:
Data Sufficiency Myths - part I: https://www.gmatprepnow.com/module/gmat- ... cy?id=1106
Data Sufficiency Myths - part II: https://www.gmatprepnow.com/module/gmat- ... cy?id=1107
Cheers,
Brent
This (and other myths) is covered in these two free videos:
Data Sufficiency Myths - part I: https://www.gmatprepnow.com/module/gmat- ... cy?id=1106
Data Sufficiency Myths - part II: https://www.gmatprepnow.com/module/gmat- ... cy?id=1107
Cheers,
Brent