请问这题怎么解?

emilzhu750

Q26:

If the units digit of the three-digit positive integer k is nonzero, 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.

没看懂题目什么意思

emilzhu750

1）tens digit 为2

2）tens digit 不确定，可能1或2

怎么算的还是没有理解