document.write( "Question 929099: The mean of 4 numbers is 5 and the mean of 3 different numbers is 12. What is the mean of the 7 numbers together? Produce an algebraic solution. Guess and check is unacceptable. \n" ); document.write( "
Algebra.Com's Answer #564091 by TimothyLamb(4379)\"\" \"About 
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x = sum of the four numbers
\n" ); document.write( "y = sum of the three numbers
\n" ); document.write( "---
\n" ); document.write( "x/4 = 5
\n" ); document.write( "y/3 = 12
\n" ); document.write( "---
\n" ); document.write( "x = 5*4
\n" ); document.write( "y = 12*3
\n" ); document.write( "---
\n" ); document.write( "x = 20
\n" ); document.write( "y = 36
\n" ); document.write( "---
\n" ); document.write( "(x + y)/7
\n" ); document.write( "(20 + 36)/7
\n" ); document.write( "---
\n" ); document.write( "answer:
\n" ); document.write( "8
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