SOLUTION: the average age of the three children in a family is 9years. if the average age of their parents is 39years, the average age of the family is:
Algebra.Com
Question 755996: the average age of the three children in a family is 9years. if the average age of their parents is 39years, the average age of the family is:
Answer by knighty2002uk(39) (Show Source): You can put this solution on YOUR website!
Assuming two parents you can average the families age using the following equation.
9+9+9+39+39=105 (total age)
105/5=21 (5 people)
Hope this helps
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