What is the average age of the whole group?

Question

In a math learning group there are three boys for every two girls. The average age of the boys is 14 years and 2 months, the average age of the girls is 13 years and 4 months.

What is the average age of the whole group?

Answer 1

3/5·(14 + 2/12) + 2/5·(13 + 4/12) = 13 + 10/12

Das Durchschnittsalter beträgt 13 Jahre und 10 Monate.