document.write( "Question 776764: the average of 5 numbers is 10. the first four numbers are 8, 9, 10, 11. find the fifth number \n" ); document.write( "
Algebra.Com's Answer #473702 by stanbon(75887)\"\" \"About 
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the average of 5 numbers is 10. the first four numbers are 8, 9, 10, 11. find the fifth number
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\n" ); document.write( "Let the 5th number be \"x\":
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\n" ); document.write( "Equation:
\n" ); document.write( "(8+9+10+11+x)/5 = 10
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\n" ); document.write( "(38+x) = 50
\n" ); document.write( "x = 12
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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