$31.5÷3.5\times 12-8=?$

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

The correct option is 100.

To evaluate the given mathematical expression, we follow the standard 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 Division

First, divide 31.5 by 3.5:

$31.5÷3.5=\frac{31.5}{3.5}=\frac{315}{35}=9$

Now substitute 9 back into the expression:

$9\times 12-8$

Step 2: Perform Multiplication

Next, multiply 9 by 12:

$9\times 12=108$

Now substitute 108 into the expression:

$108-8$

Step 3: Perform Subtraction

Finally, subtract 8 from 108:

$108-8=100$

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