Which two signs and two numbers should be interchanged in the following equation to make it correct?8 + 15 - 20 × 10 ÷ 5 = 47

• A. × and -, 15 and 20
• B. + and ÷, 10 and 20
• C. × and ÷, 5 and 8
• D. + and -, 8 and 15