According to Alfred Binet, Janice's mental age is 16 years old.
It should be noted that mental age simply means the level of mental ability of an individual.
In this case, Harry is 16 years old. His younger sister Janice is 12 years old and is able to solve math problems that the children of Harry's age solve.
Therefore, according to Alfred Binet, Janice's mental age is 16 years old since she can do what those people in the age range does.
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