If a problem is 30, the problem is the person who sits 30 cm from the computer screen. It is used to describe people that lack technical knowledge and can be used when you insult someone who's having computer problems.
thirty
thirty the thirties the numbers or years, as of a century, from thirty through thirty-nine
An thirty idiom dictionary is a great resource for writers, students, and anyone looking to expand their vocabulary. It contains a list of words with similar meanings with thirty, allowing users to choose the best word for their specific context.
Dizionario di parole simili, diverso tenore, sinonimi, di invocazione per Idioma thirty