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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?

A. 28 years.

B. 15 years.

C. 18 years.

D. 10 years.

E. None of the above

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Correct choice: C

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 Average age of 5 new students = 18 years

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Arithmetic Ability Problems on Ages

Arithmetic Ability
Problems on Ages