document.write( "Question 1045249: If I have an 77, 82, 72, 63, 90, what grade do I need on the final to have an 80 average? \n" ); document.write( "
Algebra.Com's Answer #660659 by Boreal(15235) You can put this solution on YOUR website! average=total/n \n" ); document.write( "an 80 average for six tests (five have been taken so far) \n" ); document.write( "80=total/6 \n" ); document.write( "multiply both sides by 6, and the total needed is 80*6=480 \n" ); document.write( "The current total is 77+82+72+63+90=384 \n" ); document.write( "you need 480 \n" ); document.write( "480-384=96 \n" ); document.write( "You need a 96 \n" ); document.write( "---------------- \n" ); document.write( "Check \n" ); document.write( "the first test is -3 from 80 \n" ); document.write( "the second is +2 \n" ); document.write( "the third is -8 \n" ); document.write( "the fourth is -17 \n" ); document.write( "the fifth is +10 \n" ); document.write( "The minuses add to -28, the pluses to +12. You are -16 and need +16 (above 80, which is 96) to get an average of 80 \n" ); document.write( " |