4. k is a 2-digit positive integer, the value of k is 6 times of the unit digit, what is the value of k? D
(1). the ten digit is 4 greater than unit digit.
(2). the sum of the two digits is a two-digit integer.作者: 猫猫头 时间: 2003-1-8 14:14
the problem discription must be wrong
since "the value of k is 6 times of the unit digit" means k<=54
then only 51 and 40 can meet the condition (1), but violate the "the value of k is 6 times of the unit digit" so the condition (1) may be the incorrect record;
from condition (2), we can find 48 is the only value can meet the question.
we can list all the numbers
19, 29,28,39,38,37,49,48,47,46
agree?作者: evildoll 时间: 2003-1-8 15:31
en,i think it questionable
when suppose unit digit=b,ten digit=a
so 10a+b=6b
a=b+4
then a=-4
faint
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