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8th Class Mathematics Rational Numbers Question Bank Rational Numbers

  • question_answer
    If \[\frac{3}{4}\times \frac{5}{3}\times \frac{9}{5}\times \frac{a}{b}=\frac{9}{4}\], then the additive inverse of \[\frac{a}{b}\]is

    A) \[-\frac{1}{4}\]                         

    B) \[-\frac{1}{9}\]              

    C)  \[-\,1\]      

    D)  \[\frac{-4}{9}\]

    Correct Answer: C

    Solution :

    (c) \[\frac{3}{4}\times \frac{5}{3}\times \frac{9}{5}\times \frac{9}{5}=\frac{9}{4},\]           \[\therefore \frac{a}{b}=\frac{3}{4}\times \frac{4}{9}=1\] Hence, additive inverse of 1 is -1. 


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