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6th Class Mathematics Knowing our Numbers Question Bank Number System

  • question_answer
    If\[x=(-23)+22+(-23)+22+.....\]....... (up to 40 terms) \[y=12+(-11)+12+(-11)+....\] (up to 20 terms), then find\[y-x=?\]

    A)  30                               

    B)  \[-30\]

    C)  40                               

    D) \[-40\]

    Correct Answer: A

    Solution :

    \[x=(-1)+(-1)+(-1).....\] (20 terms) \[=-20\] \[y=1+1+1\]............. (10 terms) =10 \[y-x=10-(-20)=10+20=30\]


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