document.write( "Question 937077: The average of 4 numbers is 85. If three of the numbers are 76,78, and 81. What is the fourth number\r
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Algebra.Com's Answer #570525 by Danielshinmath(31)\"\" \"About 
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The sum of the 4 numbers is 85*4= 340. To get the other number, you do 340-(76+78+81) to get 340-235=105
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