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Thnx for explaining the case when b,d are negative. It helps.

B is the OA.[/quote]

I just got this problem on a practice test and just FYI, the question stem says "a,b,c,d,e are non-negative integers"

Therefore, there is no need to explain the negative for B,D.

by chipbmk

Wed Dec 09, 2009 11:14 am
Forum: Data Sufficiency
Topic: Terminating Decimal
Replies: 8
Views: 3772

AAAHHH much better explanation than the official MGMAT.

Thanks!

by chipbmk

Mon Dec 07, 2009 4:47 pm
Forum: Data Sufficiency
Topic: Pool X and Pool Y
Replies: 9
Views: 4434

Pool X and Pool Y

If Pool Y currently contains more water than Pool X, and if Pool X is currently filled to 2/7 of its capacity, what percent of the water currently in Pool Y needs to be transferred to Pool X if Pool X and Pool Y are to have equal volumes of water? (1) If all the water currently in Pool Y were transf...

by chipbmk

Mon Dec 07, 2009 11:55 am
Forum: Data Sufficiency
Topic: Pool X and Pool Y
Replies: 9
Views: 4434

Thank you for that detailed response and the over-simplified example (even though it makes me look like an idiot :) )

Just kidding, thanks though for the explanation!

by chipbmk

Mon Nov 23, 2009 10:40 pm
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

This is what I did, let me know where I went wrong ... it looks right to me. First: I reduced the main statement to X^2+Y^2 = 85 Statement 2: x=y+1 I plugged this in to the statement above and got: -- (y+1)^2+Y^2=85 --> Y^2+2Y+1+Y^2=85 --> 2Y^2+2Y-84=0 --> Y^2+Y-42=0 --> (Y-6)(Y+7)=0 --> Y= 6, -7 F...

by chipbmk

Mon Nov 23, 2009 7:38 pm
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

Why can we not do this for statement 1: Given: W+X<0 Statement 1: X+Y<0 Given --> X+W<0 Statement 1--> X+Y<0 ______ (subtract the statements) = W-Y<0 or W<Y Doesnt that give you a definitive "no" to the question is w-y>0? or is w>y? appears like it does to me ... let me know

by chipbmk

Mon Nov 23, 2009 4:02 pm
Forum: Data Sufficiency
Topic: 11. If W +x <0, is w-y>0?
Replies: 14
Views: 8157

No one has explained why my work for statement 2 is incorrect. Anyone? Please!!

Thanks!

by chipbmk

Mon Nov 23, 2009 3:53 pm
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

Unfortunately, I was unable to follow your explanation sunnyjohn. Ershovici, where did you get "2x^2 and 4x^2" for the lengths of the sides of the widescreen? I was able to recognize that the standard was a 3-4-5 triangle, but I could not figure out how to find the sides of the widescreen ...

by chipbmk

Sat Nov 21, 2009 10:05 am
Forum: Problem Solving
Topic: TV areas
Replies: 4
Views: 1336

Can someone please look at my work for statement 2 and tell me why it is incorrect?

Moderators? Teachers?

by chipbmk

Sat Nov 21, 2009 9:58 am
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

This is what I did, let me know where I went wrong ... it looks right to me. First: I reduced the main statement to X^2+Y^2 = 85 Statement 2: x=y+1 I plugged this in to the statement above and got: -- (y+1)^2+Y^2=85 --> Y^2+2Y+1+Y^2=85 --> 2Y^2+2Y-84=0 --> Y^2+Y-42=0 --> (Y-6)(Y+7)=0 --> Y= 6, -7 Fr...

by chipbmk

Fri Nov 20, 2009 11:22 pm
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

Diplomats

Let me know how you would do it, I am not a fan of the way the test explained it.

OA: D

by chipbmk

Fri Nov 20, 2009 4:26 pm
Forum: Problem Solving
Topic: Diplomats
Replies: 2
Views: 1182

TV areas

Please take a look at the attached picture.

OA: D

Detailed explanation is appreciated, as always.

Thanks.

by chipbmk

Fri Nov 20, 2009 4:22 pm
Forum: Problem Solving
Topic: TV areas
Replies: 4
Views: 1336

Does (x+y)^2 + (x-y)^2 = 170?

Does (x+y)^2 + (x-y)^2 = 170?

1) x^2 + y^2= 85
2) x=y+1

OA: A

[spoiler]Please be detailed in your responses, especially for statement 2, I think I have proven that statement 2 can work. Will show later once people have given this a try.
[/spoiler]
Thanks!

by chipbmk

Fri Nov 20, 2009 4:15 pm
Forum: Data Sufficiency
Topic: Does (x+y)^2 + (x-y)^2 = 170?
Replies: 10
Views: 3289

Trip

On a recent trip, Cindy drove her car 290 miles, rounded to the nearest 10 miles, and used 12 gallons of gasoline, rounded to the nearest gallon. The actual number of miles per gallon that Cindy's car got on this trip must have been between A) 290/12.5 and 290/11.4 B) 295/12 and 284/11.4 C) 284/12 a...

by chipbmk

Wed Nov 18, 2009 3:39 pm
Forum: Problem Solving
Topic: Trip
Replies: 3
Views: 1591