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Source: — Data Sufficiency |
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by scoobydooby » Sat May 02, 2009 9:23 am
1) x can take any one of the values: 691, 692, 693, 694
y can take any one of 692, 693, 694, 695
x+y will vary accordingly
no unique value for x+y, not sufficient

2) x can only take 693 and y can take 694 (only 2 numbers between 692 and 695 and given that x<y)
=>gives unique value for x+y (693+694)
sufficient,
hence B
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