IQ of a person is given by the formula $I Q = \frac{M A}{C A} \times 100$
where MA is mental age and CA is chronological age. If $80 \leq I Q \leq 140$ for a group 12 years old children, find the range of their mental age.

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Solution

$80 \leq \frac{M A}{C A} \times 100 \leq 140$
$96 \leq M A \times 10 \leq 14 \times 12$
$9.6 \leq M A \leq 16.8$
range of mental age is $[9.6, 16.8]$

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IQ of a person is given by the formula IQ=MACA×100where MA is mental age and CA is chronological age. If 80≤IQ≤140 for a group 12 years old children, find the range of their mental age.

80≤MACA×100≤14096≤MA×10≤14×129.6≤MA≤16.8range of mental age is[9.6,16.8]

IQ of a person is given by the formula $I Q = \frac{M A}{C A} \times 100$
where MA is mental age and CA is chronological age. If $80 \leq I Q \leq 140$ for a group 12 years old children, find the range of their mental age.

$80 \leq \frac{M A}{C A} \times 100 \leq 140$
$96 \leq M A \times 10 \leq 14 \times 12$
$9.6 \leq M A \leq 16.8$
range of mental age is $[9.6, 16.8]$