The I.Q. of a 25 years old boy, whose mental age is 16 will be -

Intelligence Quotient (I.Q.) is a measure used to assess an individual’s intellectual ability in comparison to their age group.

 Key Points

• The traditional formula for calculating I.Q., developed by William Stern, is:

I.Q. = (Mental Age ÷ Chronological Age) × 100

Here,

• Mental Age (MA) = 16

• Chronological Age (CA) = 25

Applying the formula:
I.Q. = (16 ÷ 25) × 100 = 0.64 × 100 = 64

Hence, the correct answer is 64.