I am a two digit number I am double an odd number my units digit is half my tens digit

Answer 1

"my units digit is half my tens digit"
---> if my unit digit is x, then my tens digit is 2x

if I'm double an odd number then I must be even, and my
unit digit can only be even.
so x = 2 or 4, (x cannot be 6 or more, or else the tens digit would no
longer be a single digit)

if x = 2, then the number is 42, which is twice the odd number 21
if x = 4, then the number is 84, but that is supposed to be twice an odd, which it is not

so the only number possible is 42