Author
Message
TAGS:
VP

Joined: 18 Nov 2004

Posts: 1447

Followers: 2

Kudos [? ]:
16
[0 ] , given: 0

Question Stats:

0% (00:00) correct

0% (00:00) wrong

based on 0 sessions
See attachment

Attachments

File comment: Set
Set.doc [37.5 KiB]
Downloaded 67 times

Senior Manager

Joined: 21 Mar 2004

Posts: 445

Location: Cary,NC

Followers: 2

Kudos [? ]:
6
[0 ] , given: 0

re-posting question as jpeg

Attachments

set_165.JPEG [ 16.36 KiB | Viewed 857 times ]

_________________

ash
________________________
I'm crossing the bridge.........

Senior Manager

Joined: 21 Mar 2004

Posts: 445

Location: Cary,NC

Followers: 2

Kudos [? ]:
6
[0 ] , given: 0

now my answer

Total = 100% = 60+50+35 -2x -2y-2z+10

2(x+y+z) = 55

therefore % of people buying 2 products is

x+y+z = 27.5%

Attachments

set_165_ANS.JPEG [ 11.47 KiB | Viewed 855 times ]

_________________

ash
________________________
I'm crossing the bridge.........

Manager

Joined: 21 Jun 2004

Posts: 240

Followers: 1

Kudos [? ]:
1
[0 ] , given: 0

using the exact same diagram - i got ans as 25......

VP

Joined: 13 Jun 2004

Posts: 1128

Location: London, UK

Schools: Tuck'08

Followers: 6

Kudos [? ]:
23
[0 ] , given: 0

I am lost on this one...I found 7.5%

60+50+35 -3*10 -2(x+y+z) = 100

145 - 30 -2(x+y+z) = 100

115 - 2(x+y+z) = 100

2(x+y+z) = 15

x+y+z = 7.5

where is the mistake..I mean in a logic view

VP

Joined: 18 Nov 2004

Posts: 1447

Followers: 2

Kudos [? ]:
16
[0 ] , given: 0

Askg, thx for reposting. I think there are two issues with you equation
1) you didn't add back x+y+z after subtracting them
2) you didn't subtract 10 three times.
In my mind this shud be the eqn
100= 60+50+35 -2x -2y-2z-30 + x+y+z+10
x+y+z = 25%
However, OA is different. Any one else wanna try ?

Senior Manager

Joined: 21 Mar 2004

Posts: 445

Location: Cary,NC

Followers: 2

Kudos [? ]:
6
[0 ] , given: 0

banerjeea_98 wrote:

Askg, thx for reposting. I think there are two issues with you equation 1) you didn't add back x+y+z after subtracting them 2) you didn't subtract 10 three times. In my mind this shud be the eqn 100= 60+50+35 -2x -2y-2z-30 + x+y+z+10 x+y+z = 25% However, OA is different. Any one else wanna try ?

yeah i goofed up

I'm getting 25% as those who bought only 2 things.

But final answer should be

35%, as those who bought 3 things would automatically buy 2 things.

_________________

ash
________________________
I'm crossing the bridge.........

Last edited by

ashkg on 26 Apr 2005, 07:01, edited 1 time in total.

Senior Manager

Joined: 21 Mar 2004

Posts: 445

Location: Cary,NC

Followers: 2

Kudos [? ]:
6
[0 ] , given: 0

Antmavel wrote:

I am lost on this one...I found 7.5%

60+50+35 -3*10 -2(x+y+z) = 100

145 - 30 -2(x+y+z) = 100

115 - 2(x+y+z) = 100

2(x+y+z) = 15

x+y+z = 7.5

where is the mistake..I mean in a logic view

after subtracting all the x y z components totally, you will need to add it once.

The above equations basically come from something like this ( add all the spaces in the circles )

100 = (60-x-y-10) + (50-z-y-10) + (35-x-z-10) + x + y + z + 10

_________________

ash
________________________
I'm crossing the bridge.........

Senior Manager

Joined: 02 Feb 2004

Posts: 345

Followers: 1

Kudos [? ]:
10
[0 ] , given: 0

ashkg wrote:

Antmavel wrote:

I am lost on this one...I found 7.5%

60+50+35 -3*10 -2(x+y+z) = 100

145 - 30 -2(x+y+z) = 100

115 - 2(x+y+z) = 100

2(x+y+z) = 15

x+y+z = 7.5

where is the mistake..I mean in a logic view

after subtracting all the x y z components totally, you will need to add it once.

The above equations basically come from something like this ( add all the spaces in the circles )

100 = (60-x-y-10) + (50-z-y-10) + (35-x-z-10) + x + y + z + 10

can you not just say,

100%=A+B+C-AB-BC-CA+2ABC ?

VP

Joined: 25 Nov 2004

Posts: 1498

Followers: 6

Kudos [? ]:
27
[0 ] , given: 0

ashkg wrote:

yeah i goofed up

I'm getting 25% as those who bought only 2 things. But final answer should be

35%, as those who bought 3 things would automatically buy 2 things.

however, the question is ambigous, therefore i think both should be correct.

mirhaque wrote:

can you not just say, 100%=A+B+C-AB-BC-CA+2ABC ?

its the same thing like

kale kami or

kami kale .

VP

Joined: 18 Nov 2004

Posts: 1447

Followers: 2

Kudos [? ]:
16
[0 ] , given: 0

OA is 15%....just wanted to confirm that it is definitely wrong, there was no choice for 35%...so I chose 25%, which we all agree on...thx guys.

Manager

Joined: 13 Oct 2004

Posts: 240

Followers: 1

Kudos [? ]:
6
[0 ] , given: 0

If the Question is asking for customers who bought exactly 2 things:
60-(x+y+10) + 50-(x+z+10)+35-(y+z+10)+x-10+y-10+z-10 = 100
x+y+z = 15

VP

Joined: 18 Nov 2004

Posts: 1447

Followers: 2

Kudos [? ]:
16
[0 ] , given: 0

prep_gmat wrote:

If the Question is asking for customers who bought exactly 2 things: 60-(x+y+10) + 50-(x+z+10)+35-(y+z+10)+x-10+y-10+z-10 = 100 x+y+z = 15

you are subtracting 10% six times. I don't think that is correct. If we refer to askg's venn diagram, the eqn shoould be:

100= (60-x-y-10)+(50-y-z-10)+(35-x-z-10) + x+y+z+10

x+y+z = 25%