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Gmat Prep Question - please help

If x < 0, then sqrt (-x |x|) is a. -x b. -1 c. 1 d. x e. sqrt x OA is A . Can someone please explain how to get the answer? [spoiler]My logic was the following: x = -1. Thus -(-1) = 1, and the absolute value of -1 is 1. So the sqrt (1) is 1, thus x, OA D. FUrthermore, how can it be - isn't the squar...

by Baldini

Tue May 19, 2009 12:01 pm
Forum: Problem Solving
Topic: Gmat Prep Question - please help
Replies: 4
Views: 1171

Thanks a lot Bluementor.
Can I just ask how long it took you to get the OA? Is there anything you did to streamline your process (took me a long time to do this)?
thanks

by Baldini

Mon May 18, 2009 8:24 am
Forum: Data Sufficiency
Topic: tricky odd/even integer question
Replies: 10
Views: 6749

I just came across this question, and got the right OA. However reading the explanation above (Cramya's in particular) I am a little confused. If n = 3, then its factors are 1 and 3 (thus it has 2 factors). So 2n = 6, and its factors are 1,3 and 2. But this does not mean that 2n is "divisible by twi...

by Baldini

Mon May 18, 2009 5:04 am
Forum: Data Sufficiency
Topic: GMAT Prep 2- Quant 5
Replies: 5
Views: 1219

tricky odd/even integer question

If x, y and z are integers and xy + z is an odd integer, is x an even integer?

1. xy + xz is an even integer
2. y + xz is an odd integer

Could someone please explain how to get to the answer as quickly as possible?

Thanks

by Baldini

Sun May 17, 2009 11:02 pm
Forum: Data Sufficiency
Topic: tricky odd/even integer question
Replies: 10
Views: 6749

Dear Lisa,
Thank you very much for your valuable feedback - 710 seems just about feasible!

Regards
Baldini

by Baldini

Sun May 17, 2009 10:04 pm
Forum: Ask Stacy Blackman
Topic: Please rate my prospective chances
Replies: 2
Views: 1101

Combined Work done by A + B + C as per given data
2(1/A+1/B+1/C)=5/6+2/3+1/2 =1/2
ksh,
Your equation is slightly mistaken. It should be
(1/2A+1/2B+1/2C)=1/2
2A + 2B + 2C = 2
2(A + B + C) =2
thus A + B + C = 1

by Baldini

Sun May 17, 2009 9:20 am
Forum: Problem Solving
Topic: GMAT Prep?? (Work Rates)
Replies: 14
Views: 8919

Please rate my prospective chances

Dear Stacy, I would be interested in doing an MBA at schools such as Insead and Columbia for example. I have a GPA of 3.2 from Imperial College London (3rd top University in UK at the time) in Biology. After university I changed direction to work in business (I was no longer interested in continuing...

by Baldini

Fri May 15, 2009 7:42 am
Forum: Ask Stacy Blackman
Topic: Please rate my prospective chances
Replies: 2
Views: 1101

x & y

If x and y are integers and 2x–y= 11, then 4x+ y cannot be:

(A) –5
(B) 1
(C) 13
(D) 17
(E) 55

OA is D . CAn someone please explain how to solve this quickly?
Thanks[/spoiler]

by Baldini

Thu May 14, 2009 2:34 am
Forum: Problem Solving
Topic: x & y
Replies: 2
Views: 6416

Tennessee Warbler with question

Kate: The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of dense tree cover that formerly was a feature of most South American coffee plantations. Scott: The population of the sp...

by Baldini

Tue May 12, 2009 9:52 am
Forum: Critical Reasoning
Topic: Tennessee Warbler with question
Replies: 12
Views: 5122

|X|

If |X| is the greatest integer less than or equal to X, what is the value of |-1.6|+|3.4|+|2.7|?

Could someone please explain how to get to the OA (A)?
Thanks

by Baldini

Wed May 06, 2009 1:21 am
Forum: Problem Solving
Topic: |X|
Replies: 1
Views: 994

Concentrations Confusion

Hi, I'm trying to brush up on my "concentration/ mixture" type questions and have come across a problem which I can not solve. It relates to two similar questions: 1. One gallon of soft drink is made of 40% orange juice and 60% water, how many additional gallons of orange juice must be mixed in to m...

by Baldini

Thu Apr 30, 2009 5:18 am
Forum: Problem Solving
Topic: Concentrations Confusion
Replies: 2
Views: 1218

Thank you very much for your responses - but just to be sure, I have attached a screenshot of the original question (and will assume it was a typing error).

by Baldini

Tue Apr 28, 2009 5:09 am
Forum: Problem Solving
Topic: Surface area of the balloon
Replies: 3
Views: 18041

Surface area of the balloon

The volume of a sphere with radius r is (4/3)πr^3 and the surface area is 4πr^3. If a spherical balloon has a volume of 972π cubic centimeters, what is the surface area of the balloon in square centimeters? (A) 324 (B) 729 (C) 243π (D) 324π (E) 729π (π = pi) OA is ...

by Baldini

Tue Apr 28, 2009 3:40 am
Forum: Problem Solving
Topic: Surface area of the balloon
Replies: 3
Views: 18041

Old Test Paper Question

Can someone please explain how to do the problem in attachment?
OA is A.

Many thanks

by Baldini

Mon Apr 27, 2009 4:06 am
Forum: Problem Solving
Topic: Old Test Paper Question
Replies: 2
Views: 743

Should vs Will

I just came across this question and the OA has left me slightly perturbed. When I conceive a “calculation” I can not always associate an absolute certainty that it will happen (as yogikarma correctly says). In this example the word “will” would imply an absolute certainty about the calculation's pr...

by Baldini

Thu Apr 09, 2009 1:37 am
Forum: Sentence Correction
Topic: 134. Canadian scientists have calculated
Replies: 12
Views: 7426