Hi kop,
Both Brent and Rahul have properly solved this DS question, but I wanted to emphasize a particular rule that you'll find useful on DS questions:
"One simple variable, one equation... I can solve it"
For example, X + 4 = 10
Here, we have one simple variable and one equation, which means we CAN solve it. In a DS question, we don't have to solve it to know that there is ONLY ONE ANSWER. By definition, with ONLY ONE answer, a Fact is considered SUFFICIENT, regardless of what the answer actually is.
In Fact 2, we're told that 7/16 = 3/8 + N
While this is a bit more complex-looking than normal, it is still just "one simple variable, one equation...", so you CAN solve it and answer the question. This is a SUFFICIENT piece of data.
GMAT assassins aren't born, they're made,
Rich
