
                ### Instruction: help me answer this question IQ of a person is given by the formula, IQ = MA/CA, where MA is mental age and CA is chronological age. If 80 ≤ IQ ≤ 140 for a group of 12 years old children, find the range of their mental age., think step by step
                ### Assistant:  According to the question,
Chronological age = CA = 12 years
IQ for the age group of 12 is 80 ≤ IQ ≤ 140.
We get that
80 ≤ IQ ≤ 140
Substituting,
IQ = MA/CA
80 ≤ MA/12 ≤ 140
Further solving,
96 ≤ MA ≤ 168
9.6 ≤ MA ≤ 16.8 , The answer is 9.6 ≤ MA ≤ 16.8
