Explanation:

Certainly! Let's solve the equation:

1. Equation Transformation:

- Original Equation: 20 × 5 - 10 + 5 ÷ 2 = ?

- Interchanged Symbols: '+' with '-' and '×' with '÷':

20 ÷ 5 + 10 - 5 × 2

2. Step-by-Step Calculation:

- First, perform division: 20 ÷ 5 = 4

- Then addition: 4 + 10 = 14

- Finally, perform multiplication and subtraction: 14 - (5 × 2)

- 5 × 2 = 10 ? 14 - 10 = 4

3. Conclusion:

- The correct answer is 4.

Option 3, 4, is the correct option.