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by baller12q » Sun Mar 29, 2009 6:17 pm
When the positive integer N is divided by 25, the remainder is 13, what is the value of N?

1) n<100

2) when N is divided by 20, the remainder is 3
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by Feep » Sun Mar 29, 2009 8:38 pm
Statement (1) is clearly insufficient. N could be 13, 38, 63, or 88.

Statement (2) implies that N is the intersection of two sets: those numbers that satisfy the given condition (an extension of the above four numbers) and the set of {3, 23, 43, 63, 83...} This is not sufficient, however, as these sets cross at 63, 163, 263, 363, and so on.

Both statements combined limits the intersection to 63, and thus is sufficient. The answer is C.
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