document.write( "Question 773229: The average age of the family of 6 is 30 years,if another person is added to the family is 38.how old is the person is added to the family. \n" ); document.write( "

Algebra.Com's Answer #471381 by josmiceli(19441) $\"\"$ $\"About$

You can put this solution on YOUR website!
( sum of all 6 ages ) / 6 = 30
\n" ); document.write( "( sum of all 6 ages + age of new person ) / 7 = 38 }}}
\n" ); document.write( "---------------------------------------------
\n" ); document.write( "sum of all 6 ages = 6*30
\n" ); document.write( "sum of all 6 ages = 180
\n" ); document.write( "--------------------
\n" ); document.write( "( sum of all 6 ages + age of new person ) / 7 = 38
\n" ); document.write( "( 180 + age of new person ) / 7 = 38
\n" ); document.write( "( 180 + age of new person ) = 7*38
\n" ); document.write( "age of new person = 7*38 - 180
\n" ); document.write( "age of new person = 266 - 180
\n" ); document.write( "age of new person = 86
\n" ); document.write( "---------------------
\n" ); document.write( "check answer:
\n" ); document.write( " $\"+%28+180+%2B+86+%29+%2F+7+=+38+\"$
\n" ); document.write( " $\"+180+%2B+86+=+266+\"$
\n" ); document.write( " $\"+266+=+266+\"$
\n" ); document.write( "OK \n" ); document.write( "

\n" );