IQ of a person is given by formula: IQ`=(M A)/(C A)xx100\ ,\ w h e r e\ M A` is mental age and CA is chronological age. If `80lt=I Qlt=140` for a group of 12 year children, find the range of their mental age.

Explanation

`80 le (MA)/(CA) times 100 le 140`

`96 le MA times 10 le 14 times12`

`9.6 le MA le 16.8`

range of mental age is`[9.6,16.8]`