If '+' represents multiplication, '-' represents addition, '×' represents subtraction, and '÷' represents division, what is the result of 4 ÷ 2 + 3 × 5?
Answer: B. 20
Using the substitutions: 4 ÷ 2 + 3 × 5. First, perform division (4 ÷ 2 = 2), then multiplication (3 × 5 = 15), and finally addition (2 + 15 = 17).