document.write( "Question 463420: The average (arithmetic mean) of a set of 5 numbers is 9.6. When a sixth number is added to the set, the average of the set becomes 9. What is the sixth number? \n" ); document.write( "
Algebra.Com's Answer #317526 by alicealc(293)\"\" \"About 
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(5 * 9.6 + x)/6 = 9
\n" ); document.write( "(48 + x) = 6 * 9
\n" ); document.write( "48 + x = 54
\n" ); document.write( "x = 54 - 48 = 6\r
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\n" ); document.write( "\n" ); document.write( "so, the sixth number is 6
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