I.Q. of a person is given by I=MC×100, where M is mental age and C is chronological age. If 80≤I≤140 for a group of 12 years old children, then the range of their mental age is
A
[9.6,16.8]
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B
(9.6,16.8)
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C
[9,16]
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D
(9,16)
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Solution
The correct option is A[9.6,16.8] 80≤MC×100≤140 ⇒8≤M12×10≤14 ⇒96≤10M≤168 ⇒9.6≤M≤16.8