Correct Answer: 5 and 3

Solution : Given:
7 × 3 – 98 ÷ 14 + 5 = 31

Replace the given numbers in the options one by one with the original numbers in the given equation.
First option: 5 and 3
7 × 3 – 98 ÷ 14 + 5 = 31
⇒ 7 × 5 – 98 ÷ 14 + 3 = 31
⇒ 7 × 5 – 7 + 3 = 31
⇒ 35 – 7 + 3 = 31
⇒ 31 = 31
Second option: 7 and 98
7 × 3 – 98 ÷ 14 + 5 = 31
⇒ 98 × 3 – 7 ÷ 14 + 5 = 31
⇒ 294 – 0.5 + 5 = 31
⇒ 298.5 ≠ 31
Third option: 31 and 7
7 × 3 – 98 ÷ 14 + 5 = 31
⇒ 31 × 3 – 98 ÷ 14 + 5 = 7
⇒ 31 × 3 – 7 + 5 = 7
⇒ 91 ≠ 7
Fourth option: 3 and 14
7 × 3 – 98 ÷ 14 + 5 = 31
⇒ 7 × 14 – 98 ÷ 3 + 5 = 31
⇒ 98 – 32.6 + 5 = 31
⇒ 70.4 ≠ 31

So, only the first option satisfies the given equation. Hence, the first option i s correct.