Question

The average salary of 15 teachers is Rs. 4,500 per month, 5 teachers
now leave the school. The average salary of remaining 10 teachers now is Rs.
4,200 per month. Find the total salary per month of the Sicachers who left the
school.: APT
a Rs. 24,000
b. Rs. 25,000
c. Rs. 27,000
d. Rs. 25,500
​

Answer 1

Step-by-step explanation: The average before three teachers left the school, x1 = 4500, n1 = 15

The average after three teachers left the school, x2 = 4500 - 175 = 4325, n2 = 15 - 3 = 12

The total salary of the teachers who left the school = y

x2 = (n1 . x1 - y)/n2

4325 = (15 . 4500 - y)/12

4325 . 12 = 67500 - y

51900 = 67500 - y

y = 67500 - 51900

y = 15600

hope this helps!!!!