document.write( "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: \n" ); document.write( "
Algebra.Com's Answer #459933 by knighty2002uk(39)\"\" \"About 
You can put this solution on YOUR website!
Assuming two parents you can average the families age using the following equation.\r
\n" ); document.write( "\n" ); document.write( "9+9+9+39+39=105 (total age)\r
\n" ); document.write( "\n" ); document.write( "105/5=21 (5 people)\r
\n" ); document.write( "\n" ); document.write( "Hope this helps
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