Target Test Prep 20% Off Flash Sale is on! Code: FLASH20

Redeem
Target Test Prep
5-Day Free Trial
5-day free, full-access trial TTP

Available with Beat the GMAT members only code

MORE DETAILS
Target Test Prep
Magoosh
Magoosh
Study with Magoosh GMAT prep

Available with Beat the GMAT members only code

MORE DETAILS
Magoosh

Medium-level root/exponent question

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic

GMAT/MBA Expert

User avatar
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

Medium-level root/exponent question

by Brent@GMATPrepNow » Tue Dec 16, 2008 5:29 pm
Image

Answer: D
Top
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Tue Dec 16, 2008 5:34 pm
x^1/6 = 6

(x^1/6)^6 = 6^6

x = 6^6

sqrt((6^6)^6)

sqrt(6^36) = 6^18

D)
Top
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Tue Dec 16, 2008 5:36 pm
Brent,
Keep up the good work of posting quality questions. I have seen a few other questions that u posted also and they are good.

Regards,
Cramya
Top

GMAT/MBA Expert

User avatar
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

by Brent@GMATPrepNow » Tue Dec 16, 2008 5:45 pm
Thanks Cramya
Top
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Mon Nov 17, 2008 11:35 pm
Thanked: 6 times
Followed by:1 members

by brb588 » Tue Dec 16, 2008 6:28 pm
Yeah, you post some good stuff. I hate to see that this is only medium difficulty, as I was a little shaky how to figure it out, but I got it! :)
Top
User avatar
Legendary Member
Posts: 2134
Joined: Mon Oct 20, 2008 11:26 pm
Thanked: 237 times
Followed by:25 members
GMAT Score:730

Re: Medium-level root/exponent question

by logitech » Tue Dec 16, 2008 7:34 pm
X^(6/2)/X^(1/6) = ANSWER/6

Answer : 6^18
LGTCH
---------------------
"DON'T LET ANYONE STEAL YOUR DREAM!"
Top

GMAT/MBA Expert

User avatar
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

by Brent@GMATPrepNow » Tue Dec 16, 2008 8:37 pm
Maybe I should take back that part about "medium difficulty." I was distinguishing this question from super hard 700+ level questions.

I'd say that this question would rank in the 600-650 range.
Anyone else agree with that?
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Legendary Member
Posts: 2467
Joined: Thu Aug 28, 2008 6:14 pm
Thanked: 331 times
Followed by:11 members

by cramya » Tue Dec 16, 2008 9:22 pm
Anyone else agree with that?
Woudnt doubt an online GMAT instructor :-)
Top
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Mon Nov 17, 2008 11:35 pm
Thanked: 6 times
Followed by:1 members

by brb588 » Tue Dec 16, 2008 9:39 pm
Brent Hanneson wrote:I'd say that this question would rank in the 600-650 range.
Anyone else agree with that?
Well, in testing, I'm right at about 650, so I'll accept that. Thanks!
Top
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pm
Thanked: 33 times
Followed by:4 members

by vittalgmat » Wed Dec 17, 2008 1:34 am
x^1/6 = 6
what is the value of x ^(6*1/2) ie x^3 ?

Dividing 3 by 1/6 we get 18.
So RHS should be raised to the power of 18.


I am guessing this is a 600 level problem.

thanks
Top
Legendary Member
Posts: 621
Joined: Wed Apr 09, 2008 7:13 pm
Thanked: 33 times
Followed by:4 members

by vittalgmat » Wed Dec 17, 2008 1:35 am
Brent,
u are doing a good job by also mentioning the problem difficulty level.
Pls continue to do so that we can all benefit by it.


thanks
Top
Master | Next Rank: 500 Posts
Posts: 114
Joined: Mon Oct 20, 2008 7:03 pm
Thanked: 4 times
Followed by:5 members

by jnellaz » Wed Dec 17, 2008 11:24 am
Could someone re-post the question? Unfotunately, I am unable to see it in its current state. Best to all!
Top

GMAT/MBA Expert

User avatar
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

by Brent@GMATPrepNow » Wed Dec 17, 2008 3:38 pm
The question involves roots, so it's not easy to write out, but here goes:

If (6th root of x) = 6, then root(x^6) = ?
A) 6
B) 6 root6
C) 6^6
D) 6^18
E) 6^36

Answer: D
Brent Hanneson - Creator of GMATPrepNow.com
Image
Top
Post new topic Post Reply
• Page 1 of 1