BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

og-green ds

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 1077
Joined: Mon Dec 13, 2010 1:44 am
Thanked: 118 times
Followed by:33 members
GMAT Score:710

og-green ds

by bblast » Mon Jul 18, 2011 10:24 am
In triangle xyz, what is the length of yz ?


1>xy=3
2>xz=5.





Cant we assume it to be a 3-4-5 ? are there other values possible. I know about the theorem that sum of 2 sides is greater than 3rd side and the mod of diff between 2 sides is less than the 3rd side. So if we apply this here, are non integer values possible for yz ????
Cheers !!

Quant 47-Striving for 50
Verbal 34-Striving for 40

My gmat journey :
https://www.beatthegmat.com/710-bblast-s ... 90735.html
My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_
Top
Source: — Data Sufficiency |
Master | Next Rank: 500 Posts
Posts: 370
Joined: Sat Jun 11, 2011 8:50 pm
Location: Arlington, MA.
Thanked: 27 times
Followed by:2 members

by winniethepooh » Mon Jul 18, 2011 10:34 am
A bit confused, the statement is x-y or x*y?
Top
User avatar
Legendary Member
Posts: 1077
Joined: Mon Dec 13, 2010 1:44 am
Thanked: 118 times
Followed by:33 members
GMAT Score:710

by bblast » Mon Jul 18, 2011 10:40 am
winniethepooh wrote:A bit confused, the statement is x-y or x*y?
Hi,

The statements are lengths of the sides of the triangle.
Cheers !!

Quant 47-Striving for 50
Verbal 34-Striving for 40

My gmat journey :
https://www.beatthegmat.com/710-bblast-s ... 90735.html
My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_
Top
Master | Next Rank: 500 Posts
Posts: 370
Joined: Sat Jun 11, 2011 8:50 pm
Location: Arlington, MA.
Thanked: 27 times
Followed by:2 members

by winniethepooh » Mon Jul 18, 2011 10:56 am
The answer should be E.
By both the statements you get no certainty of length of yz, as yz can be anywhere from 2<yz<8.
So, E!
Top
Legendary Member
Posts: 1448
Joined: Tue May 17, 2011 9:55 am
Location: India
Thanked: 375 times
Followed by:53 members

by Frankenstein » Mon Jul 18, 2011 8:18 pm
bblast wrote:In triangle xyz, what is the length of yz ?

1>xy=3
2>xz=5.


Cant we assume it to be a 3-4-5 ? are there other values possible. I know about the theorem that sum of 2 sides is greater than 3rd side and the mod of diff between 2 sides is less than the 3rd side. So if we apply this here, are non integer values possible for yz ????
Hi,
You cannot assume it to be 3-4-5. Third side can be any value between 2 and 8. Non- integers are possible. If you are not convinced, just consider a right triangle with legs as 3 and 5. Hypotenuse will be sqrt(5^2+3^2) = sqrt(34) --> Non- integer(in fact irrational). So, depending on the angle between XY and XZ, the length of YZ lies between 2 to 8 (exclusive).
Cheers!

Things are not what they appear to be... nor are they otherwise
Top
User avatar
Legendary Member
Posts: 1077
Joined: Mon Dec 13, 2010 1:44 am
Thanked: 118 times
Followed by:33 members
GMAT Score:710

by bblast » Mon Jul 18, 2011 9:31 pm
thanks Frank,

i just realized I have made this mistake twice now. The other time I took the sum of 2 legs of a right triangle = 7 as sufficient.

however any combination of length is possible.
Cheers !!

Quant 47-Striving for 50
Verbal 34-Striving for 40

My gmat journey :
https://www.beatthegmat.com/710-bblast-s ... 90735.html
My take on the GMAT RC :
https://www.beatthegmat.com/ways-to-bbla ... 90808.html
How to prepare before your MBA:
https://www.youtube.com/watch?v=upz46D7 ... TWBZF14TKW_
Top
User avatar
Master | Next Rank: 500 Posts
Posts: 461
Joined: Tue May 10, 2011 9:09 am
Location: pune
Thanked: 36 times
Followed by:3 members

by amit2k9 » Mon Jul 18, 2011 11:00 pm
using a+b,

xz-xy < yz < xz + xy

5-3 < yz < 8

hence E it is.
For Understanding Sustainability,Green Businesses and Social Entrepreneurship visit -https://aamthoughts.blocked/
(Featured Best Green Site Worldwide-https://bloggers.com/green/popular/page2)
Top
Post new topic Post Reply
• Page 1 of 1