Maybe I'm reading it wrong, but I don't understand #1 . . .
2. A certain positive integer greater than 100 is displayed.
But when its two rightmost digits are erased, the number left is
Find all possible values of .
We have the number: .
. . where are digits . . . and is any positive integer.
If the two rightmost digits are erased, the number becomes: .
. . which equals
So we have: .
Since is a two-digit number, the only solution is: .