The average of 10 students and a principal is 15 . If the age of principal is reduced ,the average reduces by one .What will be the age of principal?
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Answer:
25 year
Step-by-step explanation:
10 students + principal = 11
Average = 15
Total age = 15* 11 = 165
Principal reduced now total students = 10
Average = 15-1 = 14
Total age without principal = 14*10 = 140
Principal age = 165-140 = 25 Years
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