The average salary of 15 teachers is rs 4500 per month. three teachers left the school and the average salary of the remaining teachers dropped by rs 175. find the total salary of the teachers who left the school.
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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
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
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Answer:
Step-by-step explanation:
Total Salary of 15 teachers 4500*15=67500
Average salary after 3 teachers left= 4500-175 = 4325
Total Salary of 12 teachers (after 3 teachers left) = 4325*12 = 51900
Total Salary Of 3 Teachers (Left) = 67500-51900 = 15600
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