document.write( "Question 751934: The average of three numbers is 77 . The
\n" ); document.write( "first number and second number is 78 and 79 respectively. Find the third number
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Algebra.Com's Answer #457468 by Cromlix(4381)\"\" \"About 
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total of 3 numbers = 3 * 77 = 231
\n" ); document.write( "Total of known numbers = 78 + 79 = 157
\n" ); document.write( " 231 - 157 = 74
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