Mathematical operation and symbol notation


  1. If '-' stands for '÷', '+' stands for 'x', '÷' stands for '-' and 'x' stands for '+', find out which one is correct?
    1. 49 + 7 - 3 x 5 ÷ 8 = 20
    2. 49 - 7 + 3 ÷ 5 x 8 = 24
    3. 49 x 7 + 3 ÷ 5 - 8 = 16
    4. 49 ÷ 7 x 3 + 5 - 8 = 26

  1. View Hint View Answer Discuss in Forum

    Try All option one by one

    Correct Option: B

    From option (b),
    49 - 7 + 3 ÷ 5 x 8 = 24
    Change the sign, as per the question,
    49 ÷ 7 x 3 - 5 + 8 = 24
    ⇒ 7 x 3 - 5 + 8 = 24
    ⇒ 21 - 5 + 8 = 24
    ∴ 24 = 24


  1. Select the correct combination of mathematical signs to replace '*' signs and to balance the following equation.
    6 * 4 * 12 * 12
    1. ÷, -, =
    2. +, -, ÷
    3. =, -, ÷
    4. x, -, =

  1. View Hint View Answer Discuss in Forum

    Try all option one by one.

    Correct Option: D

    6 * 4 * 12 * 12
    From option (d),
    6 x 4 - 12 = 12
    ⇒ 12 = 12



  1. If 'x' stands for '+', '<' for '-', '+' for ' ÷', '>' for 'x', '-' for '=', ' ÷' for '>' and '=' for '<', then state which of the following is true ?
    1. 3 x 4 > 2 - 9 + 3 < 3
    2. 5 x 3 < 7 ÷ 8 + 4 x 1
    3. 5 > 2 + 2 = 10 < 4 x 8
    4. 3 x 2 < 4 ÷ 16 > 2 + 4

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    Using the proper symbols in question and solve all option one by one.

    Correct Option: C

    Using the proper symbols in (c), we get
    5 x 2 ÷ 2 < 10 - 4 + 8
    ⇒ 5 x 1 < 18 - 4 ⇒ 5 < 14
    which is true.


  1. If '-' stands for '÷', '+' stands for '-', '÷' stands for 'x', 'x' stands for '+', then which one of the following equation is correct?
    1. 70 - 2 + 4 ÷ 5 x 6 = 44
    2. 70 - 2 + 4 ÷ 5 x 6 = 21
    3. 70 - 2 + 4 ÷ 5 x 6 = 341
    4. 70 - 2 + 4 ÷ 5 x 6 = 96

  1. View Hint View Answer Discuss in Forum

    Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.

    Correct Option: B

    Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.
    '-' ⇒ ÷
    '+' ⇒ '-'
    ÷ ⇒ 'x'
    'x' ⇒ '+'
    ∴ 70 ÷ 2 - 4 x 5 + 6 = 21
    ⇒ 35 - 20 + 6 = 21
    ⇒ 15 + 6 = 21
    ⇒ 21 = 21



  1. If '+' means '÷', '-' means '+', 'x' means '-' and '÷' means 'x', then what is the value of 24 ÷ 12 - 18 + 9 ?
    1. -25
    2. 0.72
    3. 15.30
    4. 290

  1. View Hint View Answer Discuss in Forum

    Using the proper symbols, we have
    24 ÷ 12 - 8 + 9
    Now Apply the BODMAS Rule

    Correct Option: D

    Using the proper symbols, we have
    24 ÷ 12 - 8 + 9
    Now Apply the BODMAS Rule,
    = 24 x 12 + 18 ÷ 9
    = 288 + 2 = 290