SOLUTION: The average age of six children is 13 years and 5 months. A seventh child joins the group, increasing the average age by two months. How old is this seventh child?
My work:
2*6
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My work:
2*6
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Question 825889: The average age of six children is 13 years and 5 months. A seventh child joins the group, increasing the average age by two months. How old is this seventh child?
My work:
2*6=12months (1year)
5+2=2 months
Answer= 13 years 7 months (after adding the two months)= 14 years 7 months
Is that correct thank you!!!
If there is a different method please let me know!!!
Gracias!!!
You can put this solution on YOUR website! Putting everything in terms of months:
13 yrs 5 mos is mos
( sum of 6 children's ages in months ) / 6 = 161
sum of 6 children's ages in months =
Let = the 7th child's age mos = 14 yrs and 7 mos
you got it right
You can put this solution on YOUR website! I'm not sure what method you used to work out your answer, but this is how I would do it.
Av age for 6 children is 13 yrs and 5 mths.
Sum of all their ages is 6*(13 yr + 5 mths) = 78 yrs + 30 mths
Av age for 7 children is 13 yrs and 7 mths (an increase of 2 mths)
Sum of all their ages is 7*(13 yr + 7 mths) = 91 yrs + 49 mths
The difference in the two totals must be the age of the 7th child.
(91 yrs + 49 mths) minus (78 yrs + 30 mths) = 13 yrs and 19 mths
So age of 7th child is 14 yrs and 7 mths
