Which of piaget's stages occurs from ages 7 to 12 years and is characterized by logical thought, reversibility, and the loss of egocentrism?

Concrete operational stage

Explanation:

The concrete operational stage is the third stage of Piaget's theory of cognitive development, predating the formal operational stage (12 and above) and arriving after the preoperational stage (2-7 years old). During this stage, children are able to make logical conclusions in terms of the things they can experience with their senses. Some examples would be noticing that rain comes down from the sky, which is a form of inductive thinking.

However, children at this age group are not yet able to think in a more abstract manner - which is why their deductive thinking abilities are not yet as well-refined as its inductive thinking ones.

answer; john stuart mill's principle of utility is your answer; /// good luck