Question
The Average age of 25 pupils in a class is ‘y’
years. If their principal, aged 50 years, joins them, the average rises by 1 year. Find the value of ‘y’.Solution
ATQ,
Sum of the present ages of all the students in the class = 25 × y = 25y years Sum of the present ages of all the students along with the principal = 25y + 50 = 26 × (y + 1) 25y + 50 = 26y + 26 y = 24 So the value of y = 24 years
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