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08 Dec 2016, 14:00
Kudos
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
80% (01:14) correct
20%
(00:43)
wrong
based on 42
sessions
History
Date
Time
Result
Not Attempted Yet
If x and y are integers, what is the value of x?
(1) The least common multiple of x and y is 840.
(2) The greatest common factor of x and y is 28.
(1) The least common multiple of x and y is 840.
(2) The greatest common factor of x and y is 28.
Pure algebraic questions like this one are no longer part of the GMAT Data Sufficiency syllabus.
For relevant Data Sufficiency questions, please check the Data Sufficiency forum:
Data Sufficiency Forum
Data Sufficiency Forum
08 Dec 2016, 21:03
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Bunuel
(1) X could be 28 or 840...not suff..
(2) x =28 & y=840
if x=840 & y=28------not suff
Combining both again as in (2)
Not suff
Ans E
09 Dec 2016, 01:36
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Option E)
X = ?
S1.
LCM(X,Y) = 840
: (X,Y) = (3,280); (280,3); (7, 120); (120,7) . . .
No unique solution
Insufficient
S2
HCF(X,Y) = 28
: (X,Y) = (28,840); (840,28)...
No unique solution
Insufficient
S1 + S2
LCM(X,Y) = 840 & HCF(X,Y) = 28
: (X,Y) = (28,840); (840,28)
No unique solution
Insufficient
X = ?
S1.
LCM(X,Y) = 840
: (X,Y) = (3,280); (280,3); (7, 120); (120,7) . . .
No unique solution
Insufficient
S2
HCF(X,Y) = 28
: (X,Y) = (28,840); (840,28)...
No unique solution
Insufficient
S1 + S2
LCM(X,Y) = 840 & HCF(X,Y) = 28
: (X,Y) = (28,840); (840,28)
No unique solution
Insufficient
