Mathematical operation and symbol notation


  1. If '@' means 'x', 'c' means '÷' % means (+) and '$' means '-', then 6%12C3@8   $   3 = ?
    1. 37
    2. 35
    3. 39
    4. 33
    5. None of these

  1. View Hint View Answer Discuss in Forum

    ∵ 6%12C3@8   $   3 = ?
    After replacing the sign according to the question
    ⇒ 6 + 12 ÷ 3 x 8 - 3 = ?
    Apply the BODMAS Rule

    Correct Option: B

    ∵ 6%12C3@8   $   3 = ?
    After replacing the sign according to the question
    ⇒ 6 + 12 ÷ 3 x 8 - 3 = ?
    Apply the BODMAS Rule
    ⇒ 6 + 4 x 8 - 3 = ?
    ⇒ 6 + 32 - 3 = ?
    ⇒ 38 - 3 = ?
    ∴ ? = 35


Direction: What should be the correct signs to balance the following equations ?

  1. 6   5   4 = 34
    1. - and +
    2. x and +
    3. ÷ and x
    4. x and -

  1. View Hint View Answer Discuss in Forum

    Let us check all the options one by one.
    From option (a),
    6 - 5 + 4 = 34 (using VBODMAS rule)

    Correct Option: B

    Let us check all the options one by one.
    From option (a),
    6 - 5 + 4 = 34 (using VBODMAS rule)
    ⇒ 10 - 5 = 34 ⇒ 5 = 34
    ∴ LHS ≠ RHS
    So, option (a) is incorrect
    From option (b),
    6 x 5 + 4 = 34 (using VBODMAS rule)
    ⇒ 30 + 4 = 34 ⇒ 34 = 34
    ⇒ LHS = RHS
    So, option (b) gives us the correct answer and hence, there is no need to check remaining options.



  1. 65 40 11 = 36
    1. - and +
    2. x and ÷
    3. ÷ and +
    4. + and x

  1. View Hint View Answer Discuss in Forum

    Let us check all the options one by one.
    From option (a),
    65 - 40 + 11 = 36 ⇒ 76 - 40 = 36

    Correct Option: A

    Let us check all the options one by one.
    From option (a),
    65 - 40 + 11 = 36 ⇒ 76 - 40 = 36
    ⇒ 36 = 36 ⇒ LHS = RHS
    So, option (a) is correct and hence there is no need to check remaining options.


  1. Which sequence of mathematical symbols can replace *in the given equation to balance the equation ?
    7 * 7 * 2 * 1 = 12
    1. x - ÷
    2. + - x
    3. x - +
    4. + x -

  1. View Hint View Answer Discuss in Forum

    Given, 7 * 7 * 2 * 1 = 12
    Let us check all the options one by one.

    Correct Option: B

    Given, 7 * 7 * 2 * 1 = 12
    Let us check all the options one by one.
    From option (a), putting the signs in given equation, we get
    7 x 7 - 2 ÷ 1 = 12 ⇒ 7 x 7 - 2 = 12
    ⇒ 49 - 2 = 12 ⇒ 47 = 12
    ⇒ LHS ≠ RHS
    So, option (a) is incorrect.
    From option (b), putting the signs in given equation, we get
    7 + 7 - 2 x 1 = 12 ⇒ 7 + 7 - 2 = 12
    ⇒ 14 - 2 = 12 ⇒ 12 = 12
    Hence, option (b) is correct and there is no need to check remaining options .



  1. If 73 + 82 = 14, 91 + 21 = 11, then 86 + 24 = ?
    1. 9
    2. 62
    3. 8
    4. 6

  1. View Hint View Answer Discuss in Forum

    As, 73 + 82 = 14
    Subtract first two numbers + Add last two numbers

    Correct Option: C

    As, 73 + 82 = 14
    ⇒ (7 - 3) + (8 + 2) = 14
    ⇒ 4 + 10 = 14
    ⇒ 14 = 14 and 91 + 21 = 11
    ⇒ (9 - 1) + (2 + 1) = 11
    ⇒ 8 + 3 = 11 ⇒ 11 = 11
    Similarly, 86 + 24 = (8 - 6) + (2 + 4) = 2 + 6 = 8