Correct Answer: × and +

Solution : Given:
27 + 3 ÷ 81 × 93 – 57

Replace the given symbols in the options one by one with the original symbols in the given equation.
First options: + and ÷
27 + 3 ÷ 81 × 93 – 57
On interchanging the mathematical signs, we get –
= 27 ÷ 3 + 81 × 93 – 57
= 9 + 81 × 93 – 57
= 9 + 7533 – 57
= 7485 ≠ 37
Second option: – and +
27 + 3 ÷ 81 × 93 – 57
On interchanging the mathematical signs, we get –
= 27 – 3 ÷ 81 × 93 + 57
= 27 – 0.037 × 93 + 57
= 27 – 3.441 + 57
= 80.559 ≠ 37
Third option: × and +
27 + 3 ÷ 81 × 93 – 57
On interchanging the mathematical signs, we get –
= 27 × 3 ÷ 81 + 93 – 57
= 1 + 93 – 57
= 37
Fourth option: ÷ and –
27 + 3 ÷ 81 × 93 – 57
On interchanging the mathematical signs, we get –
= 27 + 3 – 81 × 93 ÷ 57
= 27 + 3 – 81 × 1.63
= 27 + 3 – 132.03
= –102.03 ≠ 37

So, the third option satisfies the equation. Hence, the third option is correct.