Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 04 Jul 2015, 22:09

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Two questions from OG 12 Edition

Author Message
TAGS:
Manager
Joined: 13 Mar 2007
Posts: 98
Followers: 1

Kudos [?]: 14 [0], given: 0

Two questions from OG 12 Edition [#permalink]  05 Apr 2009, 20:29
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
I was wondering if there is a typo in Problem Solving Answer Explanations for questions 148 and 230. Please remember these questions are from OG 12 Edition.

In Q 148: How did they get y in (10(x+y) + 10y) / (x +y)? Please note this is the third step in the answer.
In Q 230: The answer explanation said 2^17 instead of 2^-17. Is this right?
 Kaplan GMAT Prep Discount Codes Knewton GMAT Discount Codes Veritas Prep GMAT Discount Codes
GMAT Tutor
Joined: 24 Jun 2008
Posts: 1169
Followers: 302

Kudos [?]: 961 [0], given: 4

Re: Two questions from OG 12 Edition [#permalink]  06 Apr 2009, 16:51
Expert's post
GMAT_700 wrote:
I was wondering if there is a typo in Problem Solving Answer Explanations for questions 148 and 230. Please remember these questions are from OG 12 Edition.

In Q 148: How did they get y in (10(x+y) + 10y) / (x +y)? Please note this is the third step in the answer.
In Q 230: The answer explanation said 2^17 instead of 2^-17. Is this right?

In Q148: That is not a typo. The numerator in the previous line is 10x + 20y; we can rewrite this as follows:

10x + 20y = 10x + 10y + 10y = 10(x + y) + 10y

That said, I find their solution to be quite awkward to this problem

In Q230: I don't see a typo here either. In the third line of the solved equation, they are dividing by 2^(-17). That's the same as dividing by 1/2^17, which is the same as multiplying by 2^17. I think that's the part of the solution you're referring to? Again, their solution is a bit awkward.
_________________

GMAT Tutor in Toronto

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com

Re: Two questions from OG 12 Edition   [#permalink] 06 Apr 2009, 16:51
Similar topics Replies Last post
Similar
Topics:
OG 12 PS - Question 163 9 24 Apr 2010, 22:20
2 OG 2 quant edition question 11 13 Jan 2010, 12:45
Problem #163 of OG 12th edition 1 21 Dec 2009, 19:26
1 gmat 12th edition review book question 2 06 Dec 2009, 08:32
OG 12th Edition - Problem Solving, Question 82 - Help 1 04 Nov 2009, 11:58
Display posts from previous: Sort by