Explanation:

- The average salary of all teachers is ?2,000 per day.

- The average salary of male teachers is ?2,500 per day.

- The average salary of female teachers is ?1,200 per day.

- There are 16 male teachers.

To find the number of female teachers, calculate as follows:

- Total salary of all teachers = Total number of teachers * Average salary = (16 + number of female teachers) * ?2,000

- Total salary of male teachers = 16 * ?2,500

- Total salary of female teachers = (Number of female teachers) * ?1,200

By setting up the equation and solving for the number of female teachers, we get:

$$

16 \times 2500 + \text{Female Teachers} \times 1200 = (16 + \text{Female Teachers}) \times 2000

$$

Solving:

$$

40000 + 1200X = 32000 + 2000X

$$

$$

8000 = 800X

$$

$$

X = 10

$$

- The correct number of female teachers is Option: 2 - 10.