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

  • question_answer
    If\[20-10\]means 200, \[8\div 4\] means \[12,\,6\times 2\] means 4 and \[100+20\] means 5, then \[100-10\times 1000\div 1000+100\times 10=?\]

    A) 0        

    B) 20

    C) 1000                           

    D) 1900

    Correct Answer: A

    Solution :

        Given that: \[20-10=200.\] But, actually\[20\times 10=200,\]so ? means \[\times .\] Given that \[8\div 4=12,\] But actually\[8+4=12.\] So, \[\div \] means\[+.\] Given that: \[6\times 2=4\]But actually\[6-2=4.\] So, \[\times \]means\[-\] Thus, in the given mathematical language \[-\]means\[\times ,\] \[\div \]means\[+\]and\[\times \]means \[-\] So, \[\div \]Given expression \[=100\times 10-1000+1000\div 100-10\] \[1000-1000+10-10=0.\]                               


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