document.write( "Question 491775: the average of the first three test grades is 78. what grade must be received on the fourth and final test to receive an average 80? \n" ); document.write( "
Algebra.Com's Answer #334767 by Alan3354(69443)\"\" \"About 
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(78*3 + g)/4 = 80
\n" ); document.write( "234 + g = 320
\n" ); document.write( "g = 86
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