document.write( "Question 401647: To get a B in math, Mary must average 80 on all tests. Suppose Mary has scored 60,72,98, and 85 on the first four test. What score does she need on the fifth test to receive a B. \n" ); document.write( "
Algebra.Com's Answer #284265 by nerdybill(7384)\"\" \"About 
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To get a B in math, Mary must average 80 on all tests. Suppose Mary has scored 60,72,98, and 85 on the first four test. What score does she need on the fifth test to receive a B.
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\n" ); document.write( "Let x = score on fifth exam
\n" ); document.write( "then
\n" ); document.write( "(60+72+98+85+x)/5 = 80
\n" ); document.write( "(315+x)/5 = 80
\n" ); document.write( "315+x = 400
\n" ); document.write( "x = 85
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