160419

The Number Jumbler works out your symbol correctly every time as only a select amount of numbers can be made whilst following the rule (9,18,27,36,45,54,63,72 and 81 for two digit numbers).
This is because for every number 1 is added onto, another 1 would have to be taken off from the original number.

For example:
58, 5+8=13 58-13=45 so if we have 59, 5+9=14 59-14=45. 45 is one of the limited numbers.

Each of the select numbers are marked with the same symbol which means that the computer can guess correctly every single time.