According to the method that Binet and Simon used to score their intelligence scale,a seven-year-old child who could correctly solve problems that the average eight-year-old could solve would have a mental age (MA) of

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Binet and Simon's intelligence scale determined a child's mental age (MA) based on the age level of tasks they could successfully complete. If a seven-year-old could solve problems typical of an eight-year-old, their mental age would be eight years.

According to the Method That Binet and Simon Used to Score