document.write( "Question 892476: Solve this equation:the average of X,Y and Z is 80. if twoo of the numbers are 74 and 78, then what is the other number? \n" ); document.write( "
Algebra.Com's Answer #540522 by algebrahouse.com(1659)\"\" \"About 
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x + y + z
\n" ); document.write( "----------- = 80 {to find average, add the numbers and divide by the number of numbers}
\n" ); document.write( "3\r
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\n" ); document.write( "\n" ); document.write( "74 + 78 + z
\n" ); document.write( "------------ = 80 {substituted 74 and 78 for two of the numbers}
\n" ); document.write( "3\r
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\n" ); document.write( "\n" ); document.write( "152 + z
\n" ); document.write( "-------- = 80 {added 74 and 78}
\n" ); document.write( "3 \r
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\n" ); document.write( "\n" ); document.write( "152 + z = 240 {multiplied each side by 3}
\n" ); document.write( "z = 88 {subtracted 152 from each side}\r
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\n" ); document.write( "\n" ); document.write( "88 is the other number
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