Answer: This tendency to try to solve problems in the same way every time is called A MENTAL SET.
Explanation: A mental set in Psychology is the tendency for an individual to come up with solutions based on their experiences in the past. It prevents an individual from finding solutions because they often believe the method used in the past is the only workable method. Like in the example above, Ricardo must have found his wallet at the back of his pant one time and therefore always check the back of his pant everytime he loses his wallet.