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02 Nov 2018, 03:54
Kudos
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
77% (00:44) correct
23%
(00:53)
wrong
based on 403
sessions
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Date
Time
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Not Attempted Yet
What is the average (arithmetic mean) of 3x and 6y?
(1) x + 2y = 7
(2) x + y = 5
(1) x + 2y = 7
(2) x + y = 5
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02 Nov 2018, 04:52
Kudos
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carcass
Question: (3x+6y)/2 = ?
Statement 1: x + 2y = 7
i.e. (3x+6y)/2 = 3*(x+2y)/2 = 3*7/2 = 10.5
SUFFICIENT
Statement 2: x + y = 5
i.e. (3x+6y)/2 = 3*(x+2y)/2
so we need x+2y but we have x+y which can not give us the value of x+2y hence
NOT SUFFICIENT
Answer: Option A
02 Nov 2018, 06:30
Kudos
Bookmarks
Can we solve it by using a linear equation system?
(1) x + 2y = 7
(2) x + y = 5
Substitute:
= > y = 2;
3x + 6y/2 -> 3x+12/2
x=-4 ?
Avarage = 3*(-4) + 12 /2 = 0
(1) x + 2y = 7
(2) x + y = 5
Substitute:
= > y = 2;
3x + 6y/2 -> 3x+12/2
x=-4 ?
Avarage = 3*(-4) + 12 /2 = 0
