The sum of the digits of a 2-digit number is 9. The number at the tens' place is double of the number at the units' place.
The 2-digit number is:
1
54
2
45
3
36
4
63
The sum of the digits of a 2-digit number is 9. The number at the tens' place is double of the number at the units' place.
The 2-digit number is: