The average age of group of 10 students is 15 years. When 5 new students joined the group, the average age rose by 1 year. The average age (in years) of the new student is :

The average age of group of 10 students is 15 years. When 5 new students joined the group, the average age rose by 1 year. The average age (in years) of the new student is : Correct Answer 18 years

Total age of 10 students = 150 years Total age of 15 students = 240 years Total age of 5 new students = 240 - 150 = 90 years ∴Average age of 5 new students = 90/5 = 18 years
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