$31.5÷3.5\times 12-8=?$

What will come in place of the question mark (?) in the following questions?

The correct answer is 100.

To solve the given mathematical expression, we must follow the order of operations (BODMAS / PEMDAS rule):

1. Division and Multiplication (from left to right)

2. Addition and Subtraction (from left to right)

The given expression is:

$31.5÷3.5\times 12-8$

Step 1: Perform the division first.

$31.5÷3.5=\frac{31.5}{3.5}=9$

Substituting this result back into the expression gives:

$9\times 12-8$

Step 2: Perform the multiplication.

$9\times 12=108$

Substituting this back into the expression gives:

$108-8$

Step 3: Perform the subtraction.

$108-8=100$

Thus, the value that comes in place of the question mark (?) is 100.