Which two signs should be interchanged in the following equation to make it correct?
46 ÷ 2 - 7 × 3 + 5 = 391) × and ÷
Given statement: 46 ÷ 2 - 7 × 3 + 5 = 39
On interchanging the above signs,
46 × 2 - 7 ÷ 3 + 5
= 46 × 2 - 2.33 + 5
= 92 - 2.33 + 5
= 97 - 2.33
= 94.67 ≠ 39
2) - and ×
Given statement: 46 ÷ 2 - 7 × 3 + 5 = 39
On interchanging the above signs,
46 ÷ 2 × 7 - 3 + 5
= 23 × 7 - 3 + 5
= 161 - 3 + 5
= 166 - 3
= 163 ≠ 39
3) + and ×
Given statement: 46 ÷ 2 - 7 × 3 + 5 = 39
On interchanging the above signs,
46 ÷ 2 7 + 3 × 5
= 23 - 7 + 3 × 5
= 23 - 7 + 15
= 38 7
= 31 ≠ 39
4) + and -
Given statement: 46 ÷ 2 - 7 × 3 + 5 = 39
On interchanging the above signs,
46 ÷ 2 + 7 × 3 - 5
= 23 + 7 × 3 - 5
= 23 + 21 - 5
= 44 - 5
= 39
Hence, ‘+ and -’ is the correct answer.

