document.write( "Question 778898: to get a B in math, Alex must average 80 on five test. Scores on the first four test were 83, 77, 81 and 78. What is the lowest score that she can get on the last text and still get a B? \n" ); document.write( "
Algebra.Com's Answer #474955 by ramkikk66(644)\"\" \"About 
You can put this solution on YOUR website!
\r\n" );
document.write( "Average is the total of the scores in all the tests / number of tests.\r\n" );
document.write( "Therefore, total of scores in all tests = Average * number of tests\r\n" );
document.write( "\r\n" );
document.write( "To get an average of 80 in 5 tests, she must score a total of 5 * 80 = 400\r\n" );
document.write( "In the first 4 tests, she has scored a total of (83+77+81+78) = 319\r\n" );
document.write( "So, to get a total of 400 she must score at least (400 - 319) = 81 in the final \r\n" );
document.write( "test. \r\n" );
document.write( "Lowest score she should get in the 5th test = 81.\r\n" );
document.write( "Hope you got it :)\r\n" );
document.write( "
\n" ); document.write( "
\n" );