Which two numbers (not digits) need to be interchanged to make the given equation correct?
$$83 + 711 - 95 \div 9 \times 2 = 20$$

Option (a) 9 and 2

$$83 + 711 - 95 \div 2 \times 9 = 20$$

This equation will not be satisfied. Because it will give values in decimals.

Option (b) 711 and 95

$$83 +95 - 711 \div 9 \times 2 = 20$$

$$83 +95 - 79 \times 2 = 20$$

$$83 +95 - 158 = 20$$

178 - 158 = 20

20 = 20

This equation is satisfied. So this is the correct answer.

Option (c) 95 and 83

$$95 + 711 - 83 \div 9 \times 2 = 20$$

This equation will not be satisfied. Because it will give values in decimals.

Option (d) 2 and 83

$$2 + 711 - 95 \div 9 \times 83 = 20$$

This equation will not be satisfied. Because it will give values in decimals.