CTET Class I to V 2012 Nov Paper

Question : 2 of 150

Marks: +1, -0

A child of 16 years scores 75 in an IQ test; his mental age will be __________ years.

Solution:

Chronological age

=16

years

{IQ}=75

Mental age

=?

Let Mental age be

x

. According to formula

{IQ}=\;{\;\text " Mental age "\;}/{\;\text " Chronological age "\;} × 100

75=\;{x}/{16} × 100

∴ x=\;{75 × 16}/{100}=12

years

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