document.write( "Question 298139: if the coach of a team of eight is counted as a member of a team, the average mass of all 9 people is 79kg. if he is not counted as a meber, the average is 81.5 k. What s the mass of the coach? \n" ); document.write( "
Algebra.Com's Answer #214567 by nerdybill(7384)\"\" \"About 
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if the coach of a team of eight is counted as a member of a team, the average mass of all 9 people is 79kg. if he is not counted as a meber, the average is 81.5 k. What s the mass of the coach?
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\n" ); document.write( "Let x = mass of coach
\n" ); document.write( "and y = mass of team
\n" ); document.write( "then
\n" ); document.write( "(x+y)/9 = 79 (equation 1)
\n" ); document.write( "y/8 = 81.5 (equation 2)
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\n" ); document.write( "solve equation 2 for y:
\n" ); document.write( "y/8 = 81.5
\n" ); document.write( "y = 81.5*8
\n" ); document.write( "y = 652
\n" ); document.write( ".
\n" ); document.write( "Substitute the above into equation 1 and solve for x:
\n" ); document.write( "(x+y)/9 = 79
\n" ); document.write( "(x+652)/9 = 79
\n" ); document.write( "x+652 = 79*9
\n" ); document.write( "x+652 = 711
\n" ); document.write( "x = 59 kg\r
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