What will come in the place of ‘?’ in the following equation, if ‘+’ and ‘–’ are interchanged and also ‘×’ and ‘÷’ are interchanged?
47 ÷ 3 – 126 × 6 + 18 = ?

The correct option is 144.

To solve the equation, we need to first substitute the mathematical operators as specified in the problem statement:
1. Interchange the plus ($+$) and minus ($-$) signs.
2. Interchange the multiplication ($\times$) and division ($÷$) signs.

Let's write down the original equation:

$47÷3-126\times 6+18=?$

After interchanging the signs as instructed, the equation becomes:

$47\times 3+126÷6-18=?$

Now, we solve this interchanged equation step-by-step using the BODMAS rule (Brackets, Orders, Division/Multiplication, Addition/Subtraction):

Step 1: Perform Division
Divide $126$ by $6$:

$126÷6=21$

Now, substitute this back into the equation:

$47\times 3+21-18=?$

Step 2: Perform Multiplication
Multiply $47$ by $3$:

$47\times 3=141$

Substitute this value back into the equation:

$141+21-18=?$

Step 3: Perform Addition
Add $141$ and $21$:

$141+21=162$

Substitute this value back into the equation:

$162-18=?$

Step 4: Perform Subtraction
Subtract $18$ from $162$ to find the final value:

$162-18=144$

Therefore, the number that comes in place of '?' is 144.