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Question

If 'A' stands for '÷', 'B' stands for 'x', 'C' stands for '+' and 'D' stands for '-', what will come in place of the question mark (?) in the following equation?
79 D 12 B 4 C 100 A 5 = ?

This question was previously asked in
RRB ALP 2025 CBT 2 Wiremen Question Paper (28-Jul-2026) (Shift 2)
The correct answer is
51

Solve Symbolic Equation: Step-by-Step Calculation

The problem requires substituting given symbols with mathematical operators and then evaluating the resulting expression using the standard order of operations (BODMAS/PEMDAS).

1. Substitution Phase

Identify the operators corresponding to each letter:

  • 'A' = '÷'
  • 'B' = 'x'
  • 'C' = '+'
  • 'D' = '-'

Substitute these operators into the given equation:

Original: \(79 D 12 B 4 C 100 A 5\)

After substitution: \(79 - 12 x 4 + 100 ÷ 5\)

2. Calculation Phase (Order of Operations)

Evaluate the expression following BODMAS/PEMDAS:

  1. Division: Calculate \(100 ÷ 5\)

    \( 100 \div 5 = 20 \)

  2. Multiplication: Calculate \(12 x 4\)

    \( 12 \times 4 = 48 \)

  3. The expression now is: \(79 - 48 + 20\)
  4. Subtraction (left to right): Calculate \(79 - 48\)

    \( 79 - 48 = 31 \)

  5. Addition: Calculate \(31 + 20\)

    \( 31 + 20 = 51 \)

3. Final Result

The value of the expression is 51.

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Similar Questions

  1. If ‘A’ stands for ‘÷’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘−’, what will come in place of the question mark ‘?’ in the following equation?

     14 A 30 B 45 C 15 D 9 = ?

  2. If ‘A’ stands for ‘+’, ‘B’ stands for ‘−’, ‘C’ stands for ‘×’ and ‘D’ stands for ‘÷’, then what will come in place of the question mark (?) in the following equation?

    28 A 16 C 3 B 12 D 4 = ?

  3. If ‘A’ stands for ‘+’, ‘B’ stands for ‘−’, ‘C’ stands for ‘×’ and ‘D’ stands for ‘÷’, then what will come in place of the question mark (?) in the following equation?

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  4. What will come in place of the question mark (?) in the following equation if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged? 

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  5. What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘−’ are interchanged and ‘x’ and ‘÷’ are interchanged?

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  6. What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘-‘ are interchanged and ‘×’ and ‘÷’ are interchanged?

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Important Questions from Mathematical Operations

  1. What will come in the place of ‘?’ in the following equation if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
    18 ÷ 9 + 24 × 3 − 16 = ?

  2. If ‘A’ stands for ‘÷’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’, and ‘D’ stands for ‘−’, what will come in place of the question mark (?) in the following equation?
    88 B 3 D 12 A 4 C 6 = ?

  3. Select the set in which the numbers are related in the same way as are the numbers of the given sets.
    (NOTE: Operations should be performed on whole numbers without breaking down the numbers into their constituent digits. E.g., 13 – Operations on 13 such as adding/subtracting/multiplying, etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)
    Given sets:
    (9, 21, 193)
    (12, 15, 184)

  4. What will come in the place of the question mark (?) in the following equation, if ‘÷’ and ‘+’ are interchanged and ‘−’ and ‘×’ are interchanged?
    44 ÷ 78 + 6 − 3 × 19 = ?

  5. Two sets of numbers are given below. In each set of numbers, certain mathematical operation(s) on the first number result(s) in the second number. Similarly, certain mathematical operation(s) on the second number result(s) in the third number and so on. Which of the given options follows the same set of operations as in the given sets?

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

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