Problem Solving
试题详情
题目：
The three-digit integer kss is the sum of the two-digit integers ks and rs , where k , r , and s are the digits of the integers. Which of the following must be true?
I. k = 2
II. r = 9
III. s = 5
选项:
A、I only
B、II only
C、III only
D、I and II
E、II and III
答案:
B
