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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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由1，k=36，27，38，39，或者40，41，42， 43 44 所以k的十位不确定。
由2，k的个位数>5,则k+5的个位数要进一位，得到4，故k的十位是3.所以2充分。1不充分。
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