SOLUTION: The Average age of family is 50 , a new baby was born then one grandpa was died at the age of 65,what is average age of family present now?
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Question 983309: The Average age of family is 50 , a new baby was born then one grandpa was died at the age of 65,what is average age of family present now?
You can put this solution on YOUR website! The Average age of family is 50, a new baby was born then one grandpa was died at the age of 65,what is average age of family present now?
:
Effectively 65 is subtracted from the total of their ages, but the number of family members remain the same, but you have to know how many in the family
let n = no. of family members
then
50n = total of all family ages
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then when grandpa was alive
when grandpa is replaced by a baby (age 0) is the new average
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we can demonstrate this, suppose their are 10 family members, then sum will be
50 * 10 = 500, an average of 50
When Grandpa is replace by a baby
(500-65)/10 = 43.5 is the average now
What if their were 20 family member then
50 * 20 = 1000
When Grandpa is replaced by a baby
1000-65/20 = 46.75 is the average now
