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IQ of a person is given by formula: IQ=(...

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.

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The correct Answer is:
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Given that : CA = 12 years
Now, `IQ = (MA)/(CA)xx100`
and ` 80 le IQ le 140`
`rArr 80 le (MA)/(CA)xx100 le 140`
`rArr 80 le (MA)/(12)xx 100 le 140`
`rArr 80 le (MA)/(3)xx 25 le 140`
`rArr 240 le MA xx 25 le 420`
`rArr 9.6 le MA le 16. 8`
Which is the required range of mental age.
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