document.write( "Question 623132: If you have 70, 75, and 90 what score do you need to get an average of 80? \n" ); document.write( "
Algebra.Com's Answer #391892 by Alan3354(69443)\"\" \"About 
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If you have 70, 75, and 90 what score do you need to get an average of 80?
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\n" ); document.write( "(70 + 75 + 90 + Score)/4 = 80
\n" ); document.write( "70 + 75 + 90 + Score = 320
\n" ); document.write( "Score = 85
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