Which two signs should be interchanged to make the following equation correct?105 ÷ 21 + 67 − 64 × 16 = 287

Explanation

Interchange × and +: 105 ÷ 21 × 67 − 64 + 16 = 5 × 67 − 64 + 16 = 335 − 64 + 16 = 287. So × and + must be interchanged.