Correct Answer: ÷ and +

Solution : Given:
81 + 3 ÷ 9 * 5 − 12 = 60

Replace the given signs in the options one by one with the original signs in the given equation.
First option: ÷ and +
= 81 ÷ 3 + 9 × 5 – 12
= 27 + 9 × 5 – 12
= 27 + 45 – 12
= 60
Second option: + and ×
= 81 × 3 ÷ 9 + 5 − 12
= 27 + 15 − 12
= 30 ≠ 60
Third option: ÷ and −
= 81 + 3 – 9 × 5 ÷ 12 = 60
= 81 + 3 – 9 × 0.416
= 81 + 3 – 3.75
= 80.25 ≠ 60
Fourth option: + and −
= 81 – 3 ÷ 9 × 5 + 12
= 81 – 0.33 × 5 + 12
= 81 – 1.66 + 12
= 91.33 = R.H.S.

So, only the first option satisfies the R.H.S. of the given equation. Hence, the first option is correct.