(A) The Intelligence Quotient $(I.Q.)$ is calculated using the formula:$I.Q. = \frac{\text{Mental Age}}{\text{Chronological Age}} \times 100$Given:Men

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(A) The Intelligence Quotient $(I.Q.)$ is calculated using the formula:$I.Q. = \frac{\text{Mental Age}}{\text{Chronological Age}} \times 100$Given:Mental Age = $14$ yearsChronological (Real) Age = $10$ yearsCalculation:$I.Q. = \frac{14}{10} \times 100 = 1.4 \times 100 = 140$Therefore,the $I.Q.$ of the child is $140$.