DS - Need Help... Big time

This topic has expert replies
Senior | Next Rank: 100 Posts
Posts: 71
Joined: Wed Aug 22, 2007 12:29 pm
Location: USA
Thanked: 12 times
Followed by:1 members

DS - Need Help... Big time

by wizardofwashington » Fri Sep 21, 2007 11:37 am
What is the average (arithmetic mean) of x and y?

(1) The average (arithmetic mean) of (x + 1) and (y - 1) is equal to the average (arithmetic mean) of x and y.
(2) The average (arithmetic mean) of x, y, and -1 is 1.

Help!!!!

OA is (highlighted below)

B
A falling tree resounds... but a forest grows in silence...
Source: — Problem Solving |

Master | Next Rank: 500 Posts
Posts: 321
Joined: Tue Aug 28, 2007 5:42 am
Thanked: 1 times

by kajcha » Fri Sep 21, 2007 11:47 am
Stmt 1 - avg of (x+1) and (y-1) can be written as x+1+y-1/2 => x+y/2.
We don't get any infor for x and y so NOT SUFF

Stmt 2 - x+y-1/3 = 1 => x+y = 4 Hence (x+y)/2 = 2 SUFF

Ans B

User avatar
Senior | Next Rank: 100 Posts
Posts: 45
Joined: Wed Jun 20, 2007 12:40 pm
Location: Cleveland, OH

by niks_01.27 » Fri Sep 21, 2007 7:48 pm
Agree B
regards
niks...