Answer :
The value of IQ is 75.
IQ(Intelligent quotient):
It is a measure of intelligence, which is applied by using the ratio of mental age to physical or chronological age, then multiply by 100.
Here we have to find the IQ:
Formula to find the IQ:
IQ =( mental age/ chronological age )× 100
Mental age = 9
chronological age = 12
Put the values in the equation, and we have:
IQ = 9/ 12 × 100
= 3 × 25
= 75
Therefore we get the IQ as 75.
To know more about the IQ( intelligent Quotient) refer to the link given below:
https://brainly.com/question/6352562
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