If the hundreds digit is twice the tens digit then the hundreds digit must be even.

The hundreds digit then can't be less than 6 because half of 4 is 2 and 2+4=6 which then wouldn't enable a third number to add up to 17.

Using 6 as the hundreds digit:

Therefore the tens digit must be three and the last 8.

The reverse then is 836, 836-638=198, so this is not the number.

Using 8:

The tens digit is 4

And the last digit must be 5

The reverse then is 548,

845-548=297

Numbers are 845 and 548.