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Out of 10 teachers of a school, one teacher retires and in his place, a new teacher of age 25 years joins. As a result,...
Solution
Let the average age of 10 teachers be = a yearsTotal sum of ages of all the 10 teachers = 10a yearsLet the age of retired teacher = b years⇒ Sum of the ages of 9 teachers excluding the age of retired teacher = (10a − b) years ———-(1)
New average age of teachers after a teacher retires and...
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