Mathematical operation and symbol notation


  1. If '+' means '-', '-', means 'x' , '÷' means '+' and 'x' means '÷', then
    10 x 5 ÷ 3 - 2 + 3 = ?
    1. 5
    2. 53/3
    3. 21
    4. 36

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    ? = 10 x 5 ÷ 3 - 2 + 3
    = 10 ÷ 5 + 3 x 2 - 3 (by interchanging sign)

    Correct Option: A

    ? = 10 x 5 ÷ 3 - 2 + 3
    = 10 ÷ 5 + 3 x 2 - 3 (by interchanging sign)
    = 2 + 3 x 2 - 3
    = 2 + 6 - 3 = 8 - 3 = 5


  1. If Q means '+', J means 'x', T means '-' and K means '÷' then
    30 K 2 Q 3 J 6 T 5 = ?
    1. 18
    2. 28
    3. 31
    4. 103

  1. View Hint View Answer Discuss in Forum

    Using the correct symbols, we have
    30 K 2 Q 3 J 6 T 5
    = 30 ÷ 2 + 3 x 6 - 5

    Correct Option: B

    Using the correct symbols, we have
    30 K 2 Q 3 J 6 T 5
    = 30 ÷ 2 + 3 x 6 - 5
    = 15 + 18 - 5 = 33 - 5 = 53



  1. If P denotes '÷', Q denotes 'x', R denotes '+' and S denotes '-', then
    18 Q 1 2 P 4 R 5 S 6
    1. 53
    2. 59
    3. 63
    4. 65

  1. View Hint View Answer Discuss in Forum

    Using the correct symbols, we have
    18 Q 1 2 P 4 R 5 S 6
    = 18 x 12 ÷ 4 + 5 - 6

    Correct Option: A

    Using the correct symbols, we have
    18 Q 1 2 P 4 R 5 S 6
    = 18 x 12 ÷ 4 + 5 - 6
    = 18 x 3 + 5 - 6
    = 54 + 5 - 6 = 59 - 6 = 53


Direction: If the given interchanges are made in signs and numbers, which one of the four equations would be correct?

  1. Given interchanges signs '+' and 'x', numbers '3' and '7'
    1. 23 + 17 x 73 = 1241
    2. 37 + 73 x 12 = 112
    3. 23 x 17 + 37 = 428
    4. 23 + 17 x 73 = 388

  1. View Hint View Answer Discuss in Forum

    (a) 27 x 13 + 37 ≠ 1241
    (b) 73 x 37 + 12 ≠ 112
    (c) 27 + 13 x 73 ≠ 428
    (d) 27 x 13 + 37 = 388

    Correct Option: D

    (a) 27 x 13 + 37 ≠ 1241
    (b) 73 x 37 + 12 ≠ 112
    (c) 27 + 13 x 73 ≠ 428
    (d) 27 x 13 + 37 = 388



  1. Given interchanges signs '-' and ' ÷'; numbers '2' and '6'
    1. 32 - 12 ÷ 6 = 30
    2. 36 ÷ 12 - 2 = 1
    3. 32 - 16 ÷ 6 = 1
    4. 36 - 12 ÷ 2 = 30

  1. View Hint View Answer Discuss in Forum

    (a) 36 ÷ 16 - 2 ≠ 30
    (b) 32 - 16 ÷ 6 ≠ 1
    (c) 36 ÷ 12 - 2 = 1
    (d) 32 ÷ 16 - 6 ≠ 30

    Correct Option: C

    (a) 36 ÷ 16 - 2 ≠ 30
    (b) 32 - 16 ÷ 6 ≠ 1
    (c) 36 ÷ 12 - 2 = 1
    (d) 32 ÷ 16 - 6 ≠ 30