标题: 2 jj want to confirm [打印本页] 作者: loulan 时间: 2002-9-30 03:18 标题: 2 jj want to confirm
DS
K is a three digit integer, whose unit digit is not zero. What is the tens digit of K.
(1) The tens digit of K + 9 is 3
(2) The tens digit of K + 4 is 2
Answer C.
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my answer is A,
3. apts, 45% have residents 3 or fewer, what is median of the residents?
1)80% have 5 or fewer
2)35% have 3 or more.
answer E
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I think answer should be D作者: tongxun 时间: 2002-9-30 09:22
2. A. k+9 and k is not equal to 0, the tens must be 2.
condition 2: the tens maybe 1 or 2.
3. E. condition 1: the median may be 4 or 5.
condition 2 is insufficient too.作者: cook 时间: 2002-9-30 11:35
What do those mean?
(1) The tens digit of K + 9 is 3
(2) The tens digit of K + 4 is 2
according literal meaning, the answer should be D .作者: tongxun 时间: 2002-9-30 11:40
cook: why the answer is D?
if k =124, then K +4=128, the tens is 2. if k=118, then 118+4=122, the tens of the sum is 2 too.
so the right answer is A作者: cook 时间: 2002-9-30 11:55
NO, you see, it ask the tens digit +9 or 4, -->D作者: xulingyan 时间: 2002-9-30 12:06
请哪位用中文解释一下好吗？作者: tongxun 时间: 2002-9-30 12:14
是第一题吧，xulingyan？
K is a three digit integer, whose unit digit is not zero. What is the tens digit of K.
(1) The tens digit of K + 9 is 3
(2) The tens digit of K + 4 is 2
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K 是一个3位数的整数，它的个位不是0，它的十位是什么？
两个条件给出的都是，K + 某个数字后的十位数。
即：K+9的十位数等于3，可知K的十位等于2。
K+4的十位等于2， 这就会有两种情况：K的个位小于等于5，或大于5。作者: cook 时间: 2002-9-30 13:09
Oh....., Got it. You are right, tongxun!
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