A child of 16 years scores 75 in an IQ test, his mental age will be .. ........... years.

Options

A. 12
B. 8
C. 14
D. 15

Answer

A

Explanation

Originally, the differences between mental age and chronological age were used to compute the Intelligence Quotient (IQ). This was computed using the ratio method, with the following formula
Mental Age `divide` Physical Age `xx` 100 = IQ
Thus, a child of 16 years scores 75 in an IQ test his mental age will be 12 years