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1. The average age of a group of 10 students is 15 years . when 5 more students joined the group , the average age rise by 1 year. what is average age of the newly joined students?
- A. 16
- B. 16
- C. 16
- D. 16
Answer: Option C
Explanation:
Let the sum of 5 new student’s age is x
Then according to question,
(150 + x)/15 = 16
= )150 + x = 240
= )x = 90
Average of their ages = sum/number
= )90/5 = 18
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