1. The average age of 14 girls and their teacher’s age is 15 years. If the teacher’s age is excluded, the average reduces by 1. What is the teacher’s age?
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By: anil on 05 May 2019 01.57 am
the average age of 14 girls and teacher is given as 15 and as we know Average = $$frac {sum of ages}{number ofpersons}$$ Sum of ages of girls and teachers = 15×15 =225 years Now the age of teacher is excluded and as a result the average reduced by 1 .So New average = 14 New number of persons = 14 Hence new sum of ages after exclusion of teacher = 14x 14 = 196 Hence age of teacher =225-196 = 29 years
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