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Question

If += -, - *, *= /, / = +; then,
what is 6+ (4*2)-3/1?

This question was previously asked in
SSC Stenographer 2025 Question Paper (06-Aug-2025) Shift 2
The correct answer is
1

Operator Substitution Explained

This question involves substituting operators based on a given code and then evaluating the resulting mathematical expression.

Operator Mapping

The given substitutions are:

  • '+' is replaced by '-'
  • '-' is replaced by '*'
  • '*' is replaced by '/'
  • '/' is replaced by '+'

Original Expression

The original expression is: $6 + (4 * 2) - 3 / 1$

Applying Operator Substitutions

Let's substitute the operators in the original expression according to the rules:

  • Replace '+' with '-': $6 - (4 * 2) - 3 / 1$
  • Replace '*' with '/': $6 - (4 / 2) - 3 / 1$
  • Replace '-' with '*': $6 - (4 / 2) * 3 / 1$
  • Replace '/' with '+': $6 - (4 / 2) * 3 + 1$

The new expression after substitution is: $6 - (4 / 2) * 3 + 1$

Evaluating the New Expression

We need to evaluate the expression $6 - (4 / 2) * 3 + 1$ using the standard order of operations (PEMDAS/BODMAS): Parentheses/Brackets, Exponents/Orders, Division and Multiplication (from left to right), Addition and Subtraction (from left to right).

Step 1: Solve the expression inside the parentheses.

Calculate $(4 / 2)$:

$ \frac{4}{2} = 2 $

The expression becomes: $6 - 2 * 3 + 1$

Step 2: Perform multiplication.

Calculate $2 * 3$:

$ 2 \times 3 = 6 $

The expression becomes: $6 - 6 + 1$

Step 3: Perform subtraction (from left to right).

Calculate $6 - 6$:

$ 6 - 6 = 0 $

The expression becomes: $0 + 1$

Step 4: Perform addition.

Calculate $0 + 1$:

$ 0 + 1 = 1 $

Final Result

The final evaluated value of the expression after operator substitution is 1.

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Similar Questions

  1. The two expressions on either side of the equal sign will have the same value if two numbers on the left-hand side are interchanged and two signs on the right-hand side are interchanged. 

    What are those two numbers (not digits) and the two signs? 

    4 × 3 ÷ 6 + 2 - 8 = 10 + 2 × 3 ÷ 5 - 18

  2. At a banquet, every 2 people shared a cake, every 6 people shared a bowl of soup, and every 8 people shared a platter of fruit. There were a total of 42 items. How many people were present at the banquet?
  3. If + means ×, × means −, − means ÷, and ÷ means +, what will be the value of the given expression?

    24 – 4 + 18 × 3 ÷ 7

  4. Which two signs need to be interchanged to make the following equation correct?
    {(78 + 70) − (6 × 2))} ÷ 2 = 10

  5. Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation. 

    (87 * 63) * 6 * 1 * 5

  6. Select the figure from among the given options that can replace the question mark (?) in the following series.

  7. If 'Alpha' means addition, 'Beta' means subtraction, 'Gamma' means multiplication, and 'Delta' means division, then what is the
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Important Questions from Mathematical Operations

  1. Select the set, from the given options, in which the numbers are related in the same way as are the numbers of the following sets.

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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.)

    (6, 13, 78)

    (5, 22, 110)

  2. If + means -, - means ×, × means ÷, ÷ means +, then what will come in place of the question mark (?) in the following equation?

    28 - 6 ÷ 4 + 14 × 14 = ?

  3. In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. Which numbers should replace X and Y so that the pattern followed by the two numbers on the left side of :: is the same as that on the right side of :: ?

    (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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.)

    X : 649 :: 956 : Y

  4. Which two numbers should be interchanged to make the given equation correct?

    75 ÷ 5 + 15 × 4 - 17 × 3 + (60 ÷ 6) × 10 = 100

    (Note: Interchange should be done of the entire number and not individual digits of a given number.)

  5. If '+' means minus, '-' means multiplication, '÷' means plus, and 'x' means division, then solve the equation: 
    15 - 3 + 10 x 5 ÷ 5

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