Mathematical operation and symbol notation

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  1. If '+' means 'minus', '-' means 'multiply', '÷' means 'plus' and 'x' means 'divide', then 10 x 5 ÷ 3 - 2 + 3 = ?








  1. View Hint View Answer Discuss in Forum

    ? = 10 x 5 ÷ 3 - 2 + 3
    As per question
    = 10 ÷ 5 + 3 x 2 - 3

    Apply the rule BODMAS

    B -Brackets first
    O -Orders (i.e. Powers and Square Roots, etc.)
    DM -Division and Multiplication (left-to-right)
    AS -Addition and Subtraction (left-to-right)

    Correct Option: A

    ? = 10 x 5 ÷ 3 - 2 + 3
    = 10 ÷ 5 + 3 x 2 - 3
    Apply the rule BODMAS
    Do things in Brackets First
    (Powers, Roots) before Multiply, Divide, Add or Subtract.
    Multiply or Divide before you Add or Subtract
    = 10 ÷ 5 + 3 x 2 - 3
    = 2 + 3 x 2 - 3
    Addition
    = 2 + 6 - 3
    Subtraction
    = 8 - 3 = 5

  1. 24   64   15
    m    11   15
    If 'm' is the resultant of the first row, what is the resultant of the second row ?










  1. View Hint View Answer Discuss in Forum

    Rules
    (i) (Odd number) x (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Hint
    1st Row 24   64   15 ⇒ 64 - 24 = 40       [rule (iii)]

    Correct Option: B

    Rules
    (i) (Odd number) x (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Solution
    1st Row 24   64   15 ⇒ 64 - 24 = 40       [rule (iii)]
    ⇒     40 + 15 = 55     [rule (ii)]
              = m
    2nd Row m   11   15 ⇒ 55   11   15
    ⇒         55 ÷ 11 = 5   [rule (iv)]
    ⇒       5 x 15 = 75     [rule (i)]
    ∴ Resultant of second row = 75

  1. 58   17   5
    85    5     n
    If 'n' is the resultant of the first row, what will be the resultant of the second row ?










  1. View Hint View Answer Discuss in Forum

    Rules
    (i) (Odd number) x (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Hint
    1st Row 58   17   5 ⇒ 58 + 17 = 75       [rule (ii)]

    Correct Option: A

    Rules
    (i) (Odd number) x (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Solution
    1st Row 58   17   5 ⇒ 58 + 17 = 75       [rule (ii)]
    ⇒     75 ÷ 5 = 15     [rule (iv)]
              = n
    2nd Row 85   5   n ⇒ 85   5   15
    ⇒         85 ÷ 5 = 17   [rule (iv)]
    ⇒       17 x 15 = 255     [rule (i)]
    ∴ Resultant of second row = 255

Direction: In each of the following questions, two rows of numbers are given. The resultant number in each row is to be worked out separately based on the following rules and the questions below the rows of number are to be answered. The operations of numbers progress from left to the right.
Rules
(i) If an odd number is followed by another composite odd number,they are to be added.
(ii) If an even number is followed by an odd number, they are to be added.
(iii) If an even number is followed by a number which is the perfect square, the even number is to be subtracted from the perfect square.
(iv) if an odd number is followed by a prime odd number, the first number is to be divided by the second number.
(v) If an add number is followed by an even number, the second one is to be subtracted from the first number.

  1. 36   15   3
    12    3    n
    If 'n' is the resultant of the first row, what will be the resultant of the second row ?










  1. View Hint View Answer Discuss in Forum

    Rules
    (i) (odd number) + (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Hint
    1st Row 36   15   3 ⇒ 36 + 15 = 51      

    Correct Option: A

    Rules
    (i) (odd number) + (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Solution
    1st Row 36   15   3 ⇒ 36 + 15 = 51       [rule (ii)]
    ⇒     51 ÷ 3 = 17     [rule (iv)]
              = n
    2nd Row 12   3   n ⇒ 12   3   17
    ⇒         12 + 3 = 15   [rule (ii)]
    ⇒       15 ÷ 17 = 15/17     [rule (iv)]
    ∴ Resultant of second row = 15/17

  1. 28   49   15
    h      3     12
    If 'h' is the resultant of the first row, what will be the resultant of the second row ?










  1. View Hint View Answer Discuss in Forum

    Rules
    (i) (odd number) + (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Hint
    1st Row 28   49   15 ⇒ 49 - 28 = 21       [rule (iii)]

    Correct Option: D

    Rules
    (i) (odd number) + (Composite odd number)
    (ii) (Even number) + (Odd number)
    (iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
    (iv) (Odd number) ÷ (Prime odd number)
    (v) (Odd number) - (Even number)
    Solution
    1st Row 28   49   15 ⇒ 49 - 28 = 21       [rule (iii)]
    ⇒ 21 + 15 = 36     [rule (i)]
              = h
    2nd Row h   3   12 ⇒ 36   6   12
    ⇒         36 + 3 = 39   [rule (ii)]
    ⇒       39 - 12 = 27     [rule (v)]
    ∴ Resultant of second row = 27