In an experiment by Piaget that involved balancing a scale with weights, children were first able to use the trial-and-error method to achieve some understanding of balancing at approximately 10 years of age.

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Piaget's theory suggests that children around the age of 10 enter the concrete operational stage, where they begin to understand concepts like balance and can use trial-and-error to solve problems.

In an Experiment by Piaget That Involved Balancing a Scale