ANSWER:
The pattern is in the following example:
The answer is: 1
5 x ? = 5 => ? = 1
OR
The answer is: 25
5 x 5 = ? => ? = 25
ALSO:
Again the answer is: 1
5 / 5 = ? => ? = 1
OR
The answer is: 25
25 / 5 = ? => ? = 5
5 x ? = 5 => ? = 1
5 x 5 = ? => ? = 25
5 / 5 = ? => ? = 1
25 / 5 = ? => ? = 5
