document.write( "Question 1107631: pls. help me to answer: if the meanof three numbers is 20 and the mean of five numbers is 12, What is the mean of the eight numbers combined? \n" ); document.write( "

Algebra.Com's Answer #722646 by josmiceli(19441) $\"\"$ $\"About$

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Let $\"+T%5B1%5D+\"$ = the total of the 3 numbers
\n" ); document.write( "Let $\"+T%5B2%5D+\"$ = the total of the 5 numbers
\n" ); document.write( "--------------------------------------------
\n" ); document.write( "(1) $\"+20+=+T%5B1%5D+%2F+3+\"$
\n" ); document.write( "(2) $\"+12+=+T%5B2%5D+%2F+5+\"$
\n" ); document.write( "-------------------------
\n" ); document.write( "(1) $\"+T%5B1%5D+=+3%2A20+\"$
\n" ); document.write( "(1) $\"+T%5B1%5D+=+60+\"$
\n" ); document.write( "and
\n" ); document.write( "(2) $\"+T%5B2%5D+=+5%2A12+\"$
\n" ); document.write( "(2) $\"+T%5B2%5D+=+60+\"$
\n" ); document.write( "-------------------------
\n" ); document.write( "Let $\"+M+\"$ = the mean of the 8 numbers
\n" ); document.write( " $\"+M+=+%28+T%5B1%5D+%2B+T%5B2%5D+%29+%2F+8+\"$
\n" ); document.write( " $\"+M+=+%28+60+%2B+60+%29+%2F+8+\"$
\n" ); document.write( " $\"+M+=+120%2F8+\"$
\n" ); document.write( " $\"+M+=+15+\"$
\n" ); document.write( "The mean of the 8 numbers is 15
\n" ); document.write( " \n" ); document.write( "

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