If + means −, − means ×, × means ÷ and ÷ means +, then what will come in place of the question mark (?) in the following equation?
84 − 6 ÷ 371 + 648 × 8 = ?

The correct answer is 794.

To solve the given mathematical expression, we first need to substitute the arithmetic operators according to the rules specified in the question:

• '+' means '−'
• '−' means '×'
• '×' means '÷'
• '÷' means '+'

The original equation is:

$84-6÷371+648\times 8=?$

Substituting the operators as per the given instructions, we get:

$84\times 6+371-648÷8$

Now, we simplify the expression using the BODMAS / PEMDAS rule (Division and Multiplication from left to right, followed by Addition and Subtraction):

Step 1: Perform Division

$648÷8=81$

Substitute this value back into the expression:

$84\times 6+371-81$

Step 2: Perform Multiplication

$84\times 6=504$

Substitute this value back into the expression:

$504+371-81$

Step 3: Perform Addition

$504+371=875$

Step 4: Perform Subtraction

$875-81=794$

Thus, the value that replaces the question mark (?) is 794.