Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is

35 years and that of the grandchildren is 6 years. What is the average age of the family?
A.28 4years7
B.31 5years7
C.32 1years7
D.None of these



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Average age of two grandparents=67 years
.·.Total age of 2 grandparents=(67×2) years=134 years

Average age of two parents=35 years
.·.Total Age of two parents=(35×2) years=70 years

Average age of three grandchildren=6 years
.·.Total age of three grandchildren=(6×3) years=18 years

.·. Total age of the Family members = (134+70+18) years=222 years
Total number of family members=(2+2+3) =7

.·.Average age of the whole family=
 \frac{Total  age  of  family  members}{No. of family members}

= \frac{222}{7} =31.7

So the correct option is B.31 5 years 7
1 4 1
Comment has been deleted
Comment has been deleted
well firstly your answer was none of these and then i deleted when i answered your option changed to mine answer so who is copying?? and stop fighting over here come to inbox.
Total age of grandparents =134 years.... Total age of parents = 70 years..... Total age of children =18 years... Total age of all of them =222years...... Average =222/7... =31.7...... So your answer is B...
0 0 0
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts