A group of friends has 10 boys and 20 girls. Average age of boys is 20 years and average age of girls is 17 years. What is the average age of the group?


weighted average, Ratio. Word Problems Solving.

A group of friends has 10 boys and 20 girls. Average age of boys is 20 years and average age of girls is 17 years. What is the average age of the group?

A) 410/20
B) 20
C) 17
D) Apple
E) 21

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