Mathematical operation and symbol notation


  1. Which one of the four interchange in signs or numbers would make the given equation correct ?
    6 x 4 + 2 = 16
    1. + and x, and 4
    2. + and x, 2 and 4
    3. + and x, 4 and 6
    4. None of these

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    Apply all option one by one.

    Correct Option: C

    Apply all option one by one.
    ∵ 6 x 4 + 2 = 16 ⇒ 4 + 6 x 2 = 16 ⇒ 4 + 12 = 16


  1. Select the correct combination of mathematical sign to replace * signs and to balance the given equation.
    15 * 24 * 3 * 6 * 17
    1. + ÷ - =
    2. + x = ÷
    3. - x = +
    4. - ÷ + =

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    Given equation → 15 * 24 * 3 * 6 * 17
    Substitute the signs from given options

    Correct Option: A

    Given equation → 15 * 24 * 3 * 6 * 17
    From option (a), substitute the signs
    15 + 24 ÷ 3 - 6 = 17
    ⇒ 15 + 24/3 - 6 = 17
    ⇒ 15 + 8 - 6 = 17
    ⇒ 23 - 6 = 17
    ∴ 17 = 17



  1. If 23 ÷ 4 = 2, 44 ÷ 8 = 32, then what will be the value of 62 ÷ 4?
    1. 9
    2. 10
    3. 8
    4. 12

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    (2)3 ÷ 4 = 2, (4)4 ÷ 8 = 32
    Therefore, (6)2 ÷ 4 = 9

    Correct Option: A

    (2)3 ÷ 4 = 2, (4)4 ÷ 8 = 32
    Therefore, (6)2 ÷ 4 = 9


  1. If 2 & 6 % 7 = 33, 4 & 6 % 8 = 54, then what will be the value of 6 % 8 & 9?
    1. 95
    2. 77
    3. 99
    4. None of these

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    Here sign '&' does not convey any meaning and sign '%' signifies '+'
    26 + 7 = 33, 46 + 8 = 54
    Therefore, 6 + 89 = 95

    Correct Option: A

    Here sign '&' does not convey any meaning and sign '%' signifies '+'
    26 + 7 = 33, 46 + 8 = 54
    Therefore, 6 + 89 = 95



  1. If 879 = 9, 625 = 1 and 586 = 9, then 785 = ?
    1. 6
    2. 7
    3. 8
    4. 9

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    879 ⇒ (7 + 9) - 8 = 8
    625 ⇒ (2 + 5) - 6 = 1
    and 586 ⇒ (8 + 6) - 5 = 9
    Similarly, 785 ⇒ (8 + 5) - 7 = 6

    Correct Option: A

    879 ⇒ (7 + 9) - 8 = 8
    625 ⇒ (2 + 5) - 6 = 1
    and 586 ⇒ (8 + 6) - 5 = 9
    Similarly, 785 ⇒ (8 + 5) - 7 = 6