Explanation:

- The given expression is: 75 × 345 + 15 - 23 ÷ (15 + 18).

- Replace the symbols with the operations they represent:

- '×' becomes addition.

- '÷' becomes subtraction.

- '+' becomes multiplication.

- '-' becomes division.

- So the expression translates to:

- 75 + 345 × 15 ÷ 23 - (15 × 18).

- First, handle the parentheses:

- 15 × 18 = 270.

- Substitute back into the expression:

- 75 + 345 × 15 ÷ 23 - 270.

- Evaluate multiplication and division first:

- 345 × 15 = 5175.

- 5175 ÷ 23 = 225.

- Substitute the results:

- 75 + 225 - 270.

- Perform addition and subtraction:

- 75 + 225 = 300.

- 300 - 270 = 30.

- The correct answer is: Option 4: 30.

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