RULE:
For any positive integers x and y, xy = (LCM of x and y)(GCF of x and y).
Statement 1:
Thus:
xy = (840)(28).
It's possible that x=1 and y=840*28.
It's possible that x=840*28 and y=1.
Since x can be different values, INSUFFICIENT.
Statement 2:
840=168*5.
It's possible that x=5 and y=168, with the result that the LCM of x and y is 840.
It's possible that x=168*5 and y=168, with the result that the LCM of x and y is 840.
Since x can be different values, INSUFFICIENT.
Statements combined:
Since xy = (840)(28) and y=168, x=(840/168)(28) = 5*28 =140.
SUFFICIENT.
The correct answer is C.
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