-No clear separation of governmental powers -Head of government is usually a Prime Minister
-Head of state is often King or Queen
-Examples are the United kingdom, Belgium, and Australia
This is a description of what type of government system?

Constitutional monarchy.

Explanation:

A Constitutional monarchy is a form of government in which monarch– King or Queen, shares power with the Consitutionalized form of government. In such form of government, the King or Queen act as a head of the state, whereas the the Prime Minister act as a head of the government.

The powers of monarchs in the Constitutional monarchy is either limited or ceremonial. Whereas the powers vested to the Prime Minister are excersied accordingly. The examples of such form of government includes UK, Australia, and Belgium.

Therefore, the Constitutional monarchy is the correct answer.