Data sufficency & problem solving

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siddhartha123: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Mon Aug 01, 2011 6:15 am; Location: vijayawada; Thanked: 1 times

by siddhartha123 » Sat Aug 06, 2011 1:37 am

Hai , this is a DS Q

1.)is |M-N|=|M|-|N|?

1.) M>N
2.) M+N>1

Pls help me out ;
it have opted B
Am i right or wrong?

2.) In a class there 11 students , their average wt has given as 44, if the least weight of 6 member weigh 44, Highest weights of 6 memebers weight 55 , what is the median of the 11 members.
a.) 40
b.) 44
c.) 50
d.) 50.5

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Source: Beat The GMAT — Problem Solving | Sat Aug 06, 2011 1:37 am

krishnasty: Master | Next Rank: 500 Posts; Posts: 142; Joined: Mon Jan 10, 2011 8:03 am; Thanked: 19 times

by krishnasty » Sat Aug 06, 2011 1:55 am

<--EDITED MY POST-->

For the first question,
IMO E

Option 1 : M>N

plug in the values
M =2,N=1 . true
M=-1,N=-2. false
Hence, INSUFFICIENT

Option 2 : M+N >1

plug in the values
M=1 N=1 ..true
M=2 N=4 ..false
Hence, INSUFFICIENT

Combining both the equations,

plug in the values
M=4 N=2 ...true
M=4 N=-2 ..false
Hence, INSUFFICIENT

Last edited by krishnasty on Sat Aug 06, 2011 2:26 am, edited 1 time in total.

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Frankenstein: Legendary Member; Posts: 1448; Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members; Location: India; Thanked: 375 times

by Frankenstein » Sat Aug 06, 2011 2:04 am

Hi,
Even combining both statements:
if m =3,n=1, |m-n| = 2 and|m|-|n| = 2
if m =3,n=-1, |m-n| = 4 and |m|-|n| = 2

Hence, E

Cheers!

Things are not what they appear to be... nor are they otherwise

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force5: Legendary Member; Posts: 582; Joined: Tue Mar 08, 2011 12:48 amFollowed by: 6 members; Thanked: 61 times; GMAT Score:740

by force5 » Sat Aug 06, 2011 5:24 am

2.) In a class there 11 students , their average wt has given as 44, if the least weight of 6 member weigh 44, Highest weights of 6 memebers weight 55 , what is the median of the 11 members.
a.) 40
b.) 44
c.) 50
d.) 50.5

median of this set has to be 44.
whats the OA?

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ajaykpat: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Mon Jun 13, 2011 8:43 am; Thanked: 1 times

by ajaykpat » Sat Aug 06, 2011 5:41 am

1) first question : both statements are insufficient

IMO:E

2) second question : Median= 44

what is the OA?

thanks,

ajp

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