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BarryLi: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Feb 08, 2011 8:55 pm; Location: Canada; Thanked: 7 times; GMAT Score:700

Examine Triangle (Image Included)

by BarryLi » Mon Feb 21, 2011 8:48 pm

Is AB greater than AC?

1) z > x

2) AC > AD

Quote

Source: Beat The GMAT — Data Sufficiency | Mon Feb 21, 2011 8:48 pm

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Mon Feb 21, 2011 8:59 pm

(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.

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Gurome, Inc.
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btgyes: Master | Next Rank: 500 Posts; Posts: 101; Joined: Thu Jan 06, 2011 12:44 am; Thanked: 1 times

by btgyes » Mon Feb 21, 2011 11:12 pm

Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.

Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!

Quote

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

by sanju09 » Tue Feb 22, 2011 12:26 am

btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!

Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Quote

btgyes: Master | Next Rank: 500 Posts; Posts: 101; Joined: Thu Jan 06, 2011 12:44 am; Thanked: 1 times

by btgyes » Tue Feb 22, 2011 2:02 am

sanju09 wrote:
btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]

Anurag didn't said this thing

but

considering things which are only possible when AD is perpendicular to BC

-----------

just think over it...

.... i don't know how to describe things without picture...

Could anybody plz mention... OA

i am pretty sure it can't be A in any case..

ta

Quote

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

by sanju09 » Tue Feb 22, 2011 2:10 am

btgyes wrote:
sanju09 wrote:
btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]
Anurag didn't said this thing

but

considering things which are only possible when AD is perpendicular to BC

-----------

just think over it...

.... i don't know how to describe things without picture...

Could anybody plz mention... OA

i am pretty sure it can't be A in any case..

ta

We have Anurag's take right on top of this post, which consideration seems to be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Quote

btgyes: Master | Next Rank: 500 Posts; Posts: 101; Joined: Thu Jan 06, 2011 12:44 am; Thanked: 1 times

by btgyes » Tue Feb 22, 2011 2:34 am

sanju09 wrote:
btgyes wrote:
sanju09 wrote:
btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]
Anurag didn't said this thing

but

considering things which are only possible when AD is perpendicular to BC

-----------

just think over it...

.... i don't know how to describe things without picture...

Could anybody plz mention... OA

i am pretty sure it can't be A in any case..

ta
We have Anurag's take right on top of this post, which consideration seems to be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?

Sanju...
i know you are very proficient....

i can't write much..

just visualize...

1st scenario -> lets say angle adc = 45
then AB > AC

now second scenario , lets say angle adc = 145

now AB < AC

i hope u understand now...

just try to visualize ...

Quote

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

by sanju09 » Tue Feb 22, 2011 2:45 am

btgyes wrote:
sanju09 wrote:
btgyes wrote:
sanju09 wrote:
btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]
Anurag didn't said this thing

but

considering things which are only possible when AD is perpendicular to BC

-----------

just think over it...

.... i don't know how to describe things without picture...

Could anybody plz mention... OA

i am pretty sure it can't be A in any case..

ta
We have Anurag's take right on top of this post, which consideration seems to be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?
Sanju...
i know you are very proficient....

i can't write much..

just visualize...

1st scenario -> lets say angle adc = 45
then AB > AC

now second scenario , lets say angle adc = 145

now AB < AC

i hope u understand now...

just try to visualize ...

Angle measure ADC or the length AD determines nothing so that AB could be compared with AC, this is why (2) is already said to be insufficient my friend, I have visualized what you wanted us to do, just tell which consideration of Anurag seems to you be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Quote

BarryLi: Senior | Next Rank: 100 Posts; Posts: 60; Joined: Tue Feb 08, 2011 8:55 pm; Location: Canada; Thanked: 7 times; GMAT Score:700

by BarryLi » Tue Feb 22, 2011 3:03 am

The OA is A

There was nothing on the diagram that indicated AD is perpendicular to BC.

The problems I am posting from this book are the ones I fail to understand, and the lack of clarity may be why. I see that this sentiment is shared by others. I will no longer be posting questions from this book.

Quote

btgyes: Master | Next Rank: 500 Posts; Posts: 101; Joined: Thu Jan 06, 2011 12:44 am; Thanked: 1 times

by btgyes » Tue Feb 22, 2011 3:03 am

sanju09 wrote:
btgyes wrote:
sanju09 wrote:
btgyes wrote:
sanju09 wrote:
btgyes wrote:
Anurag@Gurome wrote:(1) z > x implies side opposite to angle z > side opposite to angle x.
So, AC > AB or AB < AC(since side opposite to angle z is AC and side opposite to angle x is AB).
Answer to the main question is "no".
So, (1) is SUFFICIENT.

(2) AC > AD does not imply whether AB < AC or AB > AC. So, (2) is NOT SUFFICIENT.

The correct answer is A.
Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
Where did Anurag say that AD is perpendicular to BC?

(1) When two angles in a triangle are comparable, the sides opposite to those are also comparable. Sufficient

(2) If AC > AD, then z can still be equal, less, or more than x. [spoiler]Insufficient

A[/spoiler]
Anurag didn't said this thing

but

considering things which are only possible when AD is perpendicular to BC

-----------

just think over it...

.... i don't know how to describe things without picture...

Could anybody plz mention... OA

i am pretty sure it can't be A in any case..

ta
We have Anurag's take right on top of this post, which consideration seems to be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?
Sanju...
i know you are very proficient....

i can't write much..

just visualize...

1st scenario -> lets say angle adc = 45
then AB > AC

now second scenario , lets say angle adc = 145

now AB < AC

i hope u understand now...

just try to visualize ...
Angle measure ADC or the length AD determines nothing so that AB could be compared with AC, this is why (2) is already said to be insufficient my friend, I have visualized what you wanted us to do, just tell which consideration of Anurag seems to you be made on the basis that AD is perpendicular to BC?

...and why do you think that A cannot be the OA?

okie...ans will be A .. that fine...

my mistake is that

in given scenario, angle ADC will be always greater then 90

second scenario ir angle ADC < 90 is not possible because Z need to keep > X

thats fine...

thanks mate...

Quote

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

by sanju09 » Tue Feb 22, 2011 3:25 am

BarryLi wrote:The OA is A

There was nothing on the diagram that indicated AD is perpendicular to BC.

The problems I am posting from this book are the ones I fail to understand, and the lack of clarity may be why. I see that this sentiment is shared by others. I will no longer be posting questions from this book.

Nothing is wrong with the question or the source, take to light all that pesters you without hitch

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

Quote

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Tue Feb 22, 2011 3:39 am

btgyes wrote:Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!

I hope all the queries are sorted now?

Quote

btgyes: Master | Next Rank: 500 Posts; Posts: 101; Joined: Thu Jan 06, 2011 12:44 am; Thanked: 1 times

by btgyes » Tue Feb 22, 2011 3:45 am

Anurag@Gurome wrote:
btgyes wrote:Hi Anurag,

I think you have missed one point here....

ques DOES NOT say that AD is perpendicular to BC.... !

just think one again....

Thanks....!
I hope all the queries are sorted now?

Yes .. thanks a lot Anurag...

Anurag. can u plz see one ques...

https://www.beatthegmat.com/gmat-prep-t76519.html#342131

Thanks...!

Quote

GMAT/MBA Expert

Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pm; Location: Milpitas, CA; Thanked: 1854 times; Followed by:523 members; GMAT Score:770

by Anurag@Gurome » Tue Feb 22, 2011 3:54 am

btgyes wrote:
Yes .. thanks a lot Anurag...

Anurag. can u plz see one ques...

https://www.beatthegmat.com/gmat-prep-t76519.html#342131

Thanks...!

Great! Thanks.

Quote

rohu27: Legendary Member; Posts: 586; Joined: Tue Jan 19, 2010 4:38 am; Thanked: 31 times; Followed by:5 members; GMAT Score:730