The average age of friends going for watching movie is 20 years. Fifteen new friends with an average age of 12 years join the friend’s group due to which their average age become 16 years. What is the number of friends at the starting time?

The average age of friends going for watching movie is 20 years. Fifteen new friends with an average age of 12 years join the friend’s group due to which their average age become 16 years. What is the number of friends at the starting time?

1). 20
2). 25
3). 15
4). 10

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