Correct Answer - Option 2 : ÷ and -
The given equation: 5 × 4 + 12 - 3 ÷ 6 = 18
On interchanging + and -, we get:
5 × 4 - 12 + 3 ÷ 6 = 18
⇒ 8 + 0.5 = 18 (false)
On interchanging ÷ and ×, we get:
5 ÷ 4 + 12 - 3 × 6 = 18
⇒ 1.25 - 6 = 18 (false)
On interchanging × and +, we get:
5 + 4 × 12 - 3 ÷ 6 = 18
⇒ 5 + 48 - 0.5 = 18 (false)
On interchanging ÷ and -, we get:
5 × 4 + 12 ÷ 3 - 6 = 18
⇒ 20 + 4 - 6 = 18
⇒ 18 = 18
Hence, we need to interchange ÷ and - to make the situation correct.
