In numerical questions, the answer will be accepted as fully correct if the unit follows the numeric value without spaces.
According to ISO and DIN standards but there is a space between the number and unit.

Here is required by the test participants a non-standard input. How can I change it?
It would help if the spaces are removed from the response.

ISO 31-0:1992. Page 11 "3.4 Expressions for Quantities
The symbol of the unit shall be placed after the numerical value in the expression for a quantity, leaving a space between the numerical value and the unit symbol.

...the same in german DIN 5008

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Moodle 2.4