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14 Jan 2019, 22:08
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
59% (01:06) correct
41%
(01:40)
wrong
based on 192
sessions
History
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Not Attempted Yet
What is the average (arithmetic mean) of x, y, and z?
(1) —x − 4y + 3z = 14
(2) 5x + 8y + z = 26
(1) —x − 4y + 3z = 14
(2) 5x + 8y + z = 26
14 Jan 2019, 22:27
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divyadamahe
We are looking for X+y+z..
Each statement gives us three variables,so each is not sufficient..
By looking at the two equations together we can see that the adding up will give us something in terms of what we are seeking..
So add the two statements..
5x+8y+z-x-4y+3z=26+14.....4x+4y+4z=40.....x+y+z=10..
Average is 10/3
Sufficient
C
Archit3110
Major Poster
15 Jan 2019, 06:48
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divyadamahe
#1:
values of x,y,z not given
in sufficient
#2:
values of x,y,z not given
in sufficient
combining 1 & 2
we can determine x,y,z
sufficienet
IMO C
