Which two numbers (not digits), from the given options, should be interchanged to make the given equation correct?

158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3

Given equation: 158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3.

BODMAS Table: 

Let's check each option one by one.

Option 1) 15 and 158

Given: 158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3

After interchanging the numbers we get;

⇒ 15 - 64 × 6 ÷ 2 = 4 × 158 ÷ 3

⇒ 15 - 64 × 3 = 4 × 52.66

⇒ 15 - 192 = 210.64

⇒ -177 ≠ 210.64

⇒ LHS ≠ RHS

Option 2) 64 and 6

Given: 158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3

After interchanging the numbers we get;

⇒ 158 - 6 × 64 ÷ 2 = 4 × 15 ÷ 3

⇒ 158 - 6 × 32 = 4 × 5

⇒ 158 - 192 = 20

⇒ -34 ≠ 1

⇒ LHS ≠ RHS

Option 3) 64 and 4

Given: 158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3

After interchanging the numbers we get;

⇒ 158 - 4 × 6 ÷ 2 = 64 × 15 ÷ 3

⇒ 158 - 4 × 3 = 64 × 5

⇒ 158 - 12 = 320

⇒ 146 ≠ 320

⇒ LHS ≠ RHS

Option 4) 6 and 4

Given: 158 - 64 × 6 ÷ 2 = 4 × 15 ÷ 3

After interchanging the numbers we get;

⇒ 158 - 64 × 4 ÷ 2 = 6 × 15 ÷ 3

⇒ 158 - 64 × 2 = 6 × 5

⇒ 158 - 128 = 30

⇒ 30 = 30

⇒ LHS = RHS

Hence, the correct answer is "Option 4".