91
9218 9425
63 How did you get this answer? The tens digit must be six. The ones digit must be half that, therefore three.
31.5
that is 42
When you add tens to the tens digit and ones it goes ten more.
16
89 is a prime number between 70 and 100 that has the ones digit one greater than the tens digit.
Probably 73.
29
The answer depends on what the tens digit is greater than, and what the ones digit does then.
23
9218 9425
There are 45 of them.
Ten.
It is 0.45
12
4