When piaget and inhelder asked children of different ages to balance a scale using several different weights, they found that by age logic is used to understand a reciprocal relationship.?

The puberty in both girls and both may start at different ages and physical appearances change differently. Inhelder and Piaget questioned the children of different ages to balance a scale using a variety of different weights. As a result, they both found out that at the age of "14" logic is used to answer and understand a reciprocal relationship.

The answer is "14".

Gaining the support of Britain and France i believe