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 #564090 by richard1234(7193)\"\" \"About 
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Sum of first 4 numbers = 4*5 = 20
\n" ); document.write( "Sum of other three numbers = 3*12 = 36
\n" ); document.write( "Sum of all seven numbers = 20+36 = 56
\n" ); document.write( "Mean of the seven numbers = 56/7 = 8
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