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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\[4\times 8=42;\]\[6\times 4=23;\]\[8\times 6=34,\]then\[2\times 4=\]?

    A) 25                               

    B) 21

    C) 26                               

    D) 42

    Correct Answer: B

    Solution :

        The rule is: Divide the number by 2 and write the result in the reverse order. \[4\times 8=\frac{48}{2}=24\Rightarrow 42\,\text{etc}\text{.}\] \[\therefore 2\times 4=\frac{24}{2}=12\Rightarrow 21.\]


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