the average age of 45 students in a class is 13 years.15 new students with an average age of 18 years join the class. what is the average age of all the students in the class.
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Sum of the age of 45 students = 45 x 13 = 585 yr
Sum of the age of 15 students = 15 x18 = 270 yr
Sum of the age of all students = sum of the age of 45 students + sum of the age of 15 students
= 585 yr + 270 yr
=855 yr
∴ Average age of all students = 855 ⁄ 60
= 14.25 yr
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