Correct Answer: ÷ and –

Solution : Given:
64 – 8 ÷ 3 + 7 × 5 = 40

Replace the given symbols in the options one by one with the original symbols in the given equation.
First option: × and +
= 64 – 8 ÷ 3 × 7 + 5
= 64 – 18.67 + 5
= 50.33 ≠ 40
Second option: × and ÷
= 64 – 8 × 3 + 7 ÷ 5
= 64 – 24 + 1.4
= 41.4 ≠ 40
Third option: ÷ and –
= 64 ÷ 8 – 3 + 7 × 5
= 8 – 3 + 35
= 40
Fourth option: ÷ and +
= 64 – 8 + 3 ÷ 7 × 5
= 64 – 8 + 2.14
= 58.14 ≠ 40

Here, only the third option satisfies the R.H.S. of the given equation. Hence, the third option is correct.