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7th Class Mental Ability Mathematical Reasoning Question Bank Mathematical Reasoning

  • question_answer
    If the digits \[\text{ }\!\!'\!\!\text{ 4 }\!\!'\!\!\text{ }\] and\[\text{ }\!\!'\!\!\text{ 8 }\!\!'\!\!\text{ }\], signs \[\text{ }\!\!'\!\!\text{ + }\!\!'\!\!\text{ }\] and \[\text{ }\!\!'\!\!\text{ - }\!\!'\!\!\text{ }\] are interchanged, then which one of the four equations would be correct?

    A)  4 + 8 - 12 = 16     

    B)  4 - 8 + 12 = 0

    C)  8 + 4 - 12 = 24    

    D)         8 - 4 + 12 = 8

    Correct Answer: A

    Solution :

     On interchanging + and\[\div \],  and 4 and 8 we get the equation \[8-4+12=4+12=16\] which is true.


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