In Piaget's experiments with balancing a scale,trial-and-error problem solving was MOST characteristic of those of the age defined by:

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Piaget's experiments with balancing a scale primarily focused on the concept of conservation, which is a hallmark of concrete operational thought. Children in this stage (around 7-12 years old) are able to understand that the weight of an object remains the same even when its shape or appearance changes. However, they may still rely on trial-and-error problem solving strategies when trying to achieve balance on the scale, rather than using more systematic and logical methods.

In Piaget's Experiments with Balancing a Scale,trial-And-Error Problem Solving Was