1) X can end in a 6 or 1 --> Not sufficient
2) If y is 10, x could equal 25, or if y is 17 x would equal 18 Not sufficient
Using Y as a constraint possible here are potential values for x
Y X (if x+y = 35) X (if x+y = 70)
10 25 60
17 18 53
24 11 46
X could equal 11 or 46, the answer is E.
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GMAT Quantitative Review
