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15 May, 17:06

One's intelligence quotient, or IQ, varies directly as a person's mental age and inversely as that person's chronological age. A person with the mental age of 25 and a chronological age of 20 has an IQ of 125. What is the chronological age of a person with a mental age of 40 and an IQ of 80?

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  1. 15 May, 17:23
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    (Mental Age / Chronological Age) (100) = IQ

    (40/Chronological Age) = 80

    (40) (100) = 80 (Chronological Age)

    (40) (100) / 80=Chronological Age

    50=Chronological Age

    That is the formula for calculating what you needed.
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