document.write( "Question 154521: Mary took 5 English tests. Her scores were 78%, 89%, 98%, 67%, and 90%.
\n" ); document.write( "What must she score on her sixth test so her average will be 85%?
\n" ); document.write( " \n" ); document.write( "

Algebra.Com's Answer #113768 by nerdybill(7384) $\"\"$ $\"About$

You can put this solution on YOUR website!
Let x = score on her sixth test
\n" ); document.write( "then to average an 85:
\n" ); document.write( "(78+89+98+67+90+x)/6 =85
\n" ); document.write( "(422+x)/6 =85
\n" ); document.write( "422+x = 510
\n" ); document.write( "x = 510 - 422
\n" ); document.write( "x = 88 \n" ); document.write( "

\n" );