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Can't really fault a guy for typos, can you? Along with them comes errata or newer revisions. And I have yet to see incorrect answers in his recent publications, so am curious as to exactly what you are referring. Overall his stuff seems very well vetted, and he's been around for quite some time now...

by chieftang

Fri Jan 20, 2012 12:11 am
Forum: GMAT Strategy
Topic: GMAT Hacks
Replies: 3
Views: 2066

Cons: You may be wasting time on questions that would never be asked on the GMAT. I think that sums it up for me. Not a big fan of using non-GMAT questions to study for the GMAT. In studying for GMAT-style questions, you should be able to pick up the concepts tested on the GMAT. And that's what mat...

by chieftang

Thu Jan 19, 2012 3:21 pm
Forum: GMAT Strategy
Topic: Best way to utilise LSAT CR Questions
Replies: 6
Views: 1884

Big fan of GMAT Hacks here. I've been reading Sackmann's material and have some of his question sets. Not all 1800 questions, though. Sackmann is a believer in quality over quantity, and I agree with him. I really have no use for 1800 questions. I'd probably never even look at half of them.

by chieftang

Thu Jan 19, 2012 7:47 am
Forum: GMAT Strategy
Topic: GMAT Hacks
Replies: 3
Views: 2066

LCM is probably the best approach to number picking here. But, let's face it, you don't even have to pick convenient numbers to get to the solution. Let's pick a prime number like 7. Let E=7. Then, H=7/2 and M=7/3. This doesn't really make sense, unless we do creative counting for people who also ha...

by chieftang

Thu Jan 19, 2012 6:58 am
Forum: Problem Solving
Topic: How should my approach be to these kind of problems?
Replies: 7
Views: 1790

There are three different types of majors in different ratios. Let's use 12 since it has numerous multiples.

Let E=12.

Then, H=6 and M=4.

So, H:M = 6:4 = 3:2

by chieftang

Wed Jan 18, 2012 9:07 am
Forum: Problem Solving
Topic: How should my approach be to these kind of problems?
Replies: 7
Views: 1790

I also came up with 7:3.

Looked at it like this:

Given: AP:PB = 4:3 and the parallel line info, then we know PD:DB=4:3 also.

So PD = 4/7*PB. Call AP 4 & PB 3. Then PD = 12/7

So AP:PD = 4:12/7 = 28/7:12/7 = 28:12 = 7:3

by chieftang

Tue Jan 17, 2012 1:40 pm
Forum: Problem Solving
Topic: Similar Triangles problem.
Replies: 7
Views: 3310

Hello everyone, Is there a clear answer to this question. What is the best way to decide whether a particular question can be solved faster using algebra or using the plugging mechanism Is there any method apart from these? Regards, Vishal Here's my advice. When doing practice questions, solve them...

by chieftang

Tue Jan 17, 2012 11:59 am
Forum: Problem Solving
Topic: Plugging in or to solve using algebra, which approach is bet
Replies: 2
Views: 921

Pretty good question.

I ended up with a quadratic eqn T^2 - 20T + 64 = 0, factored to (T-16)(T-4)=0, and threw out the soln 4 without further thought since it wasn't an answer choice. Interestingly, though, that soln is the weight... But that left me with T=16 for the age. Answer C

by chieftang

Tue Jan 17, 2012 9:46 am
Forum: Problem Solving
Topic: How old is he now?
Replies: 7
Views: 4763

If x and y are nonzero, is (x^3)(y^5)/(x^2)(y^3)>0 1). x>0 2). y>0 1. Let y<0, then (positive)(negative) / (positive)(negative) = positive Let y>0, then (positive)(positive) / (positive)(positive) = positive SUFFICIENT 2. Let x < 0, then (negative)(positive) / (positive)(positive) = negative Let x ...

by chieftang

Thu Jan 12, 2012 4:20 pm
Forum: Data Sufficiency
Topic: number properties
Replies: 2
Views: 721

Have you taken both the official GMAT prep tests?

If so, just try to relax. Review any notes you might have, go in to the test with a confident attitude, and be sure to let us know how it goes!!

by chieftang

Wed Jan 11, 2012 8:02 pm
Forum: GMAT Strategy
Topic: Two Days to Go--how should I spend them?
Replies: 18
Views: 3302

By the way, if this really is an actual GMAT question then you should not be posting it here.

[edited by moderator]

by chieftang

Wed Jan 11, 2012 12:54 pm
Forum: Problem Solving
Topic: sorry to cause the inconvenient cause in my last post
Replies: 5
Views: 1170

rijul007 wrote:
kakz wrote:If yz does not equal zero. Is 0<y<1?
(1)y<1/y
(2)y=z^2
(1)y<1/y

0<y<1 or y<0
you can take y = 1/2 and y = -2 as examples
Insufficient
Not quite.. y<-1, not y<0.

Try -1/2 as an example. :)


Edit: oops PEMDAS already covered it.

by chieftang

Wed Jan 11, 2012 9:59 am
Forum: Data Sufficiency
Topic: Inequality
Replies: 9
Views: 1223

What is the value of X? 1. X^4 = |X| 2. X^2 > X OA: C I was confused about the 2 statements because I thought they contradict each other Source: another GMAT site Statement 1: x� = |x|. Case 1: x� = x. x� - x = 0. x(x³ - 1) = 0. x = 0 or x=1. Case 2: x� = -x. x� + x = 0. x(x³ + 1) = 0. ...

by chieftang

Tue Jan 10, 2012 10:51 am
Forum: Data Sufficiency
Topic: DS
Replies: 3
Views: 1374