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题库 / Prep2007E2-DS-171
If k is a positive integer and the tens digit of k + 5 is 4, what is the tens digit of k ?
(1) k > 35
(2) The units digit of k is greater than 5.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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剖析考点，关键问题是：k+5是否进了位
k>35,无法确定它是否有进位，e.g. 38，41
k的个位数大于5，k+5肯定有进位，则能够确定k的十数位
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