2. Questions Bank
  3. 9th Class
  4. Mental Ability
  5. Mathematical Operations

9th Class Mental Ability Mathematical Operations Question Bank Mathematical Operations

  • question_answer
    If \[\times \] stands for ?,\[\div \] stands for +, + stands for \[\div \] and ? stands for\[\times \], which one of the following equations is correct?

    A) \[15-5\div 5\times 20+10=6\]

    B)        \[8\div 10-3+5\times 6=8\]

    C) (c)\[6\times 2+3\div 12-3=15\]   

    D) \[3\div 7-5\times 10+3=10\]

    E) None of these

    Correct Answer: B

    Solution :

    Explanation Option [b] is correct. Using the proper signs, we get: Expression in\[(A)=15\times 5+5-20\div 10=15\times 5+5-2=75+5-2=78\]. Expression in\[(B)=8+10\times 3\div 5-\frac{3}{5}-6=8+6-6=8\]. Expression in \[(C)=6-2\div 3+12\times 3=6-\frac{2}{3}+36=42-\frac{2}{3}=\frac{124}{3}\] Expression in\[(D)=3+7\times 5-10\div 3=3+7\times 5-\frac{10}{3}=3+35-\frac{10}{3}=\frac{104}{3}\].


You need to login to perform this action.
You will be redirected in 3 sec spinner