If + means −, − means ×, × means ÷, and ÷ means +, what will be the value of the following expression?
20 × 5 – 7 ÷ 4 + 3 = ?

The correct option is 29.

To find the value of the given expression, we substitute the mathematical operations according to the rules provided in the question:

- Multiplication ($\times$) is replaced by Division ($÷$)

- Subtraction ($-$) is replaced by Multiplication ($\times$)

- Division ($÷$) is replaced by Addition ($+$)

- Addition ($+$) is replaced by Subtraction ($-$)

The original expression is:

$20\times 5-7÷4+3$

Substituting the operations as defined, the expression becomes:

$20÷5\times 7+4-3$

Now, we evaluate the expression using the BODMAS rules (performing Division, Multiplication, Addition, and then Subtraction in order):

First, perform the division:

$20÷5=4$

Substituting this value back gives:

$4\times 7+4-3$

Next, perform the multiplication:

$4\times 7=28$

Substituting this value back gives:

$28+4-3$

Next, perform the addition:

$28+4=32$

Finally, perform the subtraction:

$32-3=29$

Therefore, the final value of the expression is 29.