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IQ of a person is given by the formula I...

IQ of a person is given by the formula `I Q =(M A)/(C A)xx100` where MA is mental age and CA is chronological age. If `80lt=I Qlt=140` for a group of 12 years old children, find the range of their mental age.

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`80 <= IQ <= 140`
`80 <= (MA)/(CA)*100 <= 140`
`80 <= (MA)/12*100 <= 140`
`(80*12)/100 <= MA <= 140*12/100`
`48/5 <= MA <= 84/5`
`9.6 <= MA <= 16.8`
`:. MA in [9.6, 16.8]`
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