Correct Answer: 5 and 49, ÷ and −

Solution : Given:
686 − 14 × 49 + 400 ÷ 5 = 596

Replace the given symbols and numbers in the options one by one with the original symbols and numbers in the given equation.
First option: 5 and 49, ÷ and −
= 686 ÷ 14 × 5 + 400 − 49
= 245 + 400 − 49
= 596 = R.H.S.
Second option: 686 and 5, + and –
= 5 + 14 × 49 – 400 ÷ 686
= 5 + 686 – 0.58
= 690.42 ≠ 596
Third option: 14 and 49, × and –
= 686 × 49 – 14 + 400 ÷ 5
= 33614 – 14 + 80
= 33680 ≠ 596
Fourth option: 14 and 5, + and ×
686 − 5 + 49 × 400 ÷ 14
= 686 −1405
= 719 ≠ 596

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