document.write( "Question 816103: [ If three numbers average 6, and two of these average 5, what is the third number? ]
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Algebra.Com's Answer #491357 by TimothyLamb(4379)\"\" \"About 
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(i + j + k)/3 = 6
\n" ); document.write( "i + j + k = 18
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\n" ); document.write( "(i + j)/2 = 5
\n" ); document.write( "i + j = 10
\n" ); document.write( "i = 10 - j
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\n" ); document.write( "i + j + k = 18
\n" ); document.write( "10 + k = 18
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\n" ); document.write( "Answer:
\n" ); document.write( "k = 8
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\n" ); document.write( "Solve and graph linear equations:
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\n" ); document.write( "Solve quadratic equations, quadratic formula:
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\n" ); document.write( "Convert fractions, decimals, and percents:
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\n" ); document.write( "Calculate and graph the linear regression of any data set:
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