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7th Class Mental Ability Mathematical Operations Question Bank Mathematical Operations

  • question_answer
    If '+' stands for 'division \['\div '\] stands for 'multiplication \['\times '\] stands for 'subtraction 'and \['-'\] stands for 'addition', then which one of the following equations is correct?

    A) (a) \[18\div 6\times 7+5-2=22\]                           

    B) (b) \[18+6\div 7\times 5-2=18\]

    C) (c) \[18\div 6-7+5\times 2=\text{ }20~\]              

    D) (d) \[18\div 6+7-5-2=\text{ }16\]

    Correct Answer: B

    Solution :

    (b) : Using the correct symbols in [B] we get LHS \[=18\div 6\times 7-5+2=3\times 7-5+2\text{ }=21-5+2=18\]


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