What will come in place of the question mark (?) when + and − are interchanged and 5 and 18 are also interchanged?
5 − 18 + 12 = ?

The correct answer is Option 4: 11.

To solve this problem, we need to interchange the specified mathematical operators and numbers in the given equation and then calculate the result step-by-step using standard order of operations (BODMAS/PEMDAS).

Step 1: Identify the given equation and changes required

Original equation:
5 − 18 + 12 = ?

Interchanges to perform:
• Swap the operators '+' and '−'
• Swap the numbers 5 and 18

Step 2: Apply the interchanges to the equation

• Replace 5 with 18
• Replace '−' with '+'
• Replace 18 with 5
• Replace '+' with '−'
• The number 12 remains unchanged

After applying these changes, the new equation becomes:

$18+5-12=?$

Step 3: Perform the calculations

First, add 18 and 5:

$18+5=23$

Next, subtract 12 from 23:

$23-12=11$

Thus, the value that replaces the question mark (?) is 11.