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

  • question_answer
    If the given interchanges namely: signs \[+\] and \[\div \] and numbers 2 and 4 are made in signs and numbers, which one of the following four equations would be correct?

    A)  \[2+4\div 3=3\]       

    B)  \[4+2\div 6=1.5\]

    C)  \[4\div 2+3=4\]       

    D)  \[2+4\div 6=8.\]

    Correct Answer: D

    Solution :

        Interchanging (\[+\]and\[\div \]) and (2 and 4), we get: (a) \[4\div 2+3=3\]or\[5=3,\] which is false (b) \[2\div 4+6=1.5\]or\[6.5=1.5,\] which is false. (c) \[2+4\div 3=4\] or \[\frac{10}{3}=4,\] which is false. (d) \[4\div 2+6=8\]or \[8=8,\] which is true.


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