The average age of a group of 10 students is 15 years. When 5 more students join the group, the average age increase by 1 year. The average age of the new students is?

18 years
21 years
19 years
20 years

Correct Answer: 18 years

Explanation:

Total age of 10 students = 150 years Total age of 15 students = 240 years Total age of 5 new students = 240 - 150 = 90 years Therefore, average age of 5 new students = 90/5 = 18 years

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