document.write( "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?
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Algebra.Com's Answer #604083 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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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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\n" ); document.write( "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
\n" ); document.write( "let n = no. of family members
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\n" ); document.write( "50n = total of all family ages
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\n" ); document.write( "then when grandpa was alive
\n" ); document.write( " $\"%2850n%29%2Fn+=+50\"$
\n" ); document.write( "when grandpa is replaced by a baby (age 0)
\n" ); document.write( " $\"%2850n-65%29%2Fn\"$ is the new average
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\n" ); document.write( "we can demonstrate this, suppose their are 10 family members, then sum will be
\n" ); document.write( "50 * 10 = 500, an average of 50
\n" ); document.write( "When Grandpa is replace by a baby
\n" ); document.write( "(500-65)/10 = 43.5 is the average now
\n" ); document.write( "What if their were 20 family member then
\n" ); document.write( "50 * 20 = 1000
\n" ); document.write( "When Grandpa is replaced by a baby
\n" ); document.write( "1000-65/20 = 46.75 is the average now \n" ); document.write( "

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