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  5. Number System and its Operations

SSC Quantitative Aptitude Number System and its Operations Question Bank Set Theory (I)

  • question_answer
    20 teachers of a school either teach Mathematics or Physics. 12 of them teach Mathematics, while 4 teach both the subjects. Then, the number of teachers teaching Physics is

    A) 12

    B) 8

    C) 16

    D) None of these

    Correct Answer: A

    Solution :

    [a] Let\[n\,(P)=\]Number of teachers in Physics                      \[n\,(M)=\]Number of teachers in Maths \[\because \]       \[n\,(P\cup M)=n\,(P)+n\,(M)-n\,(P\cap M)\] \[\therefore \]      \[20=n\,(P)+12-4\] \[\Rightarrow \]   \[n\,(P)=12\]


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