What was the original numerical concept of an intelligence quotient?

Name: What was the original numerical concept of an intelligence quotient?
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The original numerical concept of an intelligence quotient was mental age divided by chronological age multiplied by 100. This was developed by psychologist Alfred Binet in the early 1900s to assess intellectual abilities of children. However, this concept has since been replaced by other intelligence tests that have a more complex scoring system.

What Was the Original Numerical Concept of an Intelligence Quotient