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7th Class Mathematics Related to Competitive Exam Question Bank Mathematical Operations

  • question_answer
    DIRECTIONS: In each of the following questions, three statements of numbers following same rules are given. Find the rule and accordingly find the value of the number? If\[3+8=17;\]\[5-2=23;\]\[6\times 2=72,\]then\[8\div 4=\]?

    A) 12                               

    B) 18

    C) 25                               

    D) 16

    Correct Answer: D

    Solution :

        The rule is: \[a+b={{a}^{2}}+b;\,\]\[a-b={{a}^{2}}-b;\] \[a\times b={{a}^{2}}\times b\] \[\therefore \]    \[8\div 4={{8}^{2}}\div 4=64\div 4=16\]


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